question

network administators have set up a hub and spoke topology with redundant connection using eigrp however they are concerned that a network Between Router R1 and router R2 will cause traffic from the 10.1.1.x network to the 10.1.2.x network to traverse the remote office links and overwhelm them. What command should be used to configure the spoke routers as EIGRP stub routers that will not advertise connected network, static routes, or summary addresses?

answer

eigrp stub receive-only

question

network admin is managing a hub and -spoke netowrk with EIGRP routintg that has been enabled. The hub router is tying to query a remote router. However, delays are occuring that are caused by certain paths bing stuck in active or SIA how should the admin configure EIGRP in order to limit the scope of the query range and prevent SIA form occuring

answer

Configure the remote router as a stub router

question

Which EIGRP routing statments are true?

answer

1.EiGRP sends periodic hello packets to the multicast IP address 224.0.0.10 2.EIGRP will not form a neighbor relationship with another peer when their ASnumber , and K values either or both are mismatched 3.EiGRP supports five generic packetypes, including Hello, Update, Query, Reply, and ACK packets

question

Which Netflow component is applied to an interface and collects information about flows?

answer

flow monitor

question

A boston company bought the assests of a NY company and is trying to route traffic between the two data networks using EIGRP over EoMPLS. As a network consultant, you were asked to verify the interoperability of the two networks From the show ip route command output what cna you tell the customer about the traffic flow between the subnet in NY 172.16.8.0/24 ande the subnets in boston

answer

look for the following when you see this questions 10.0.0.0/8 is a summary null 0 172.16.0.0/16 is a summary NULL0 Auto-summary must be disabled on N1 and B1 before traffic can flow between 172.16.8.0 subnet and subnets 172.16.16.0 and 10.10.16.0

question

Redisributions question What will the Eigrp routes appear s in routing table of R1(ospf area 0)? (learn how to do this!)

answer

E2

question

Which statement about the use of tunneling to migrate to IPV6 is true?

answer

Tunneling does not enable users of the new protocol to communicate with users of the old protocl with out dual-stack hosts

question

OE2

answer

Means Routes are redistributed into OSPF calculates metric from the ASBR to the Final Destination

question

OIA

answer

THis network is in an area that this router doesn't have an interface in

question

A company has a Frame Relay WAN with one central-site router and 100 Branch routers. All routers use point to point subinterfaces and one subnet per PVC . What kind of neighborship will this router have with each branch?

answer

The central site-router has 100 fully adjacent neighborships with the 100 branches.

question

When using tunneling to migrate to IPV6 Tunneling does not enable users of the new protocol to communicate with users of the old protocol without?

answer

Dual-stack hosts

question

For security purposes and IPV6 traffic filter was configured under various interfaces on the local router However, shortly after implementint the traffic filter, Ospfv3 neighbor adjacencies were lost. what caused this?

answer

THe link-local addresses that were used by ospf v3 were explicitly denied , which caused the neighbor relationships to fail.

question

You are the network admin of ROute.com company you have been tasked to implement a hub and spoke EIGRP toploogy over frame relay to provide connectivity between the networks at headquarters and all 300 spokes. Before you begin th actual implementation, which three pieces of information are more important to know than the others?

answer

1. The commited information rate or CIR of all the frame relay PVC's 2. THe cisco IOS version running on all the routers 3. The routing policy such as whether or not the spokes can be used as a backup transient point between the two headquarter routers

question

A network engineer has left a Netflow capture enabled over the weekend to gather information regarding excessive bandwidth utilization. The following command is entered Show flow exporter Flow_exporter-1 What is the expected output?

answer

The current status of the specified flow exporter

question

Which three TCP enhancement s can be used with TCP selective acknowledgements

answer

1. explicit congestion notification 2.Keepalive 3.Time stamps

question

When an EIGRP topology change is detected , what is the correct order of events when there is a feasible successor?

answer

1. Dual is notified 2. The neighbor adjacency is deleted 3. Remove all topology entries learned from that neighbor 4. The feasible route is used

question

Which method allows IPv4 and Ipv to work together without requiring both to be used for a single connection= during the migration process

answer

Dual-stack method

question

A network engineer executes the show ip flow export command. Which line in the output indicates that the send queue is full and export packets are not being sent?

answer

output drops

question

You are a network engineer with route.com a small It company route.com has two connections to the internet one via a frame relay link and one via an Eompls link. It policy requires that all outbound http traffic use the frame relay link when it is available. All other traffic may use either link. No static or default routing is allowed. Choose and configure the appropriate path selection feature to accomplish this task. You may use the test workstation to generate http traffic to validate your solution

answer

We need to configure policy based routing to send specific traffic along a path that is different from the best path in the routing table.

question

Conifgure policy based routing to send http traffic to the frame relay link and all other traffic to use either the link. What are the steps to do this?

answer

You need to configure an access list to route http traffic. After that configure the routemap and then apply it on the interface to the server in the EIGRP network 1.First create the access list that catches the Http traffic: command: access-list 101 permit tcp any any eq www 2. Configure the route map that sets the next hop address to be ISP1 and permits the rest of the traffic COMMAND: route-map pbr permit 10 match ip address101 set ip next-hop 10.1.100.2 copy run start exit route-map pbr permit 20 copy run start exit 3. NOw apply the route map on the interface to the server in the Eigrp network COMMAND: int fa0/1 policy route map pbr copy run start exit

question

If the primary path goes down, what will Eigrp use to reach a destination?

answer

Feasible successor

question

EIGRP has been configured on all routers in the network. What additional configuration statement should be included on R4 to advertise a default route to its neighbors? ! router eigrp 4 network 10.0.0.0 network 172.16.0.0 no auto-summary

answer

ip default-network 10.0.0.0

question

What conclusion can be derived from the show eigrp topology? R1# P 10.1.2.0/24, 1 succors, FD is 281600 via Connected, FastEthernet0/0 A 10.6.1.0/24 0 successors, FD is 3385160704, Q 1 replies, active 00:00:41, query-origin : Local origin Remaining replies: via 10.1.2.1, r. FastEthernet 0/0

answer

R1 is waiting for a reply from the neighbor 10.1.2.1 in response to the query sent out about network 10.6.1.0/24

question

what does "D EX" mean in the following sh ip route output? sh ip route C 10.1.1.0 is directly connected, FastEthernet0.0 D 172.16.0.0/16 [90/156160] via 10.1.1.1, 00:07:48 Fa0/0 D EX 192.168.1.0/24 [170/1308160] via 10.1.1.1, 00:00:11, fa0/0

answer

192.168.1.0 Is a redistributed route into EIGRP

question

What des the authoritative flag mean in regards to the NHRP information? router# Shipnhrp detail 10.1.1.2/8 via 10.2.1.2, Tunnel1 created 00:00:12, expire 01:59:47 TypE, dynamic, Flags: authoritative unique nat registered used NBMA address 10.12.1.2

answer

It was obtained directly form the next-hop server

question

Looking at the top0logy diagram which statement is true router eigrp 1 redistribute rip metric 10 100 255 1 1500 network 10.1.1.1 0.0.0.0 auto-summary

answer

The 10.1.1.0/24 subnet will appear as 10.0.0.0/8 in the R5 routing table

question

Review the implementation to implement EIGRP load balancing for traffic between hosts on the 172.16.10.0/24 and 172.16.20.0/24 networks. You have been asked to review the implementation plan. What needs to be added? 1. establish a traffic through put baseline 2. configure variance on R1 and R4 3. Use trace-route to validate load balancing has been activated. 4. Establish a new traffic throughput baseline. 5. Compare the new and old baselines and verify that load balancing is implemented as desired.

answer

It is complete as written.

question

A network engineer is configuring a solution to allow failover of HSRP nodes during maintenance windows, as an alternative to powering down the active router and letting the network respond accordingly Which action will allow for manual switching of HSRP nodes?

answer

Track the up/down state of a loopback and shutdown this interface during maintenance.

question

After implementing EIGRP on your network, you issue the show ip eigrp traffic command on router C. The following output doesn't change for 45 minutes. ? SIA queries SIA replies input queue high water mark Acks sent/received Replies sent/ received Queries sent /received updates sent/recieved

answer

THe network is stable

question

if you have a T1 access line with four 56K VCs, you should configure the bandwidth to be 224Kbps (4 * 56Kbps) in order to avoid dropping packets. If the total bandwidth of the virtual circuits equals or exceeds the access line speed, configure the bandwidth to equal the access line speed. Note that if the virtual circuits are of different capacities, the bandwidth must be set to take into account the lowest capacity virtual circuit. Based on the above info what must be done on Router A in order to make EIGRP work effectively in a Frame Relay multipoint environment with 56K VC's to avoid packet drops?

answer

Issue the command bandwidth 224 on the physical interface

question

after proper configuratrion of redistribution form EIGRP to OSPF The OSPF router doesn't contain any eigrp routes what could be the cause?

answer

The subnets Keyword was not included in the redistribute command under router ospf 1

question

Your network consists of a large hub-and spoke Frame Relay network with a CIR of 56kb/s for each spoke. Why would eigrp be a good dynamic protocol for this?

answer

Eigrp gives you the ability to manage how much bandwidth is consumed over the Frame Relay interface

question

Ipv6 has just been deployed to all of the hosts within a network, But not to the SERVERS. Which feature allows IPV6 to communicatie with IPv4 SERVERS? a. dual-stack NAT b.NAT64

answer

The correct answer is b. NAT64

question

Which statement about a non-zero value for the load metric k2 is true?

answer

EIGRP considers the load of an interface only when sending an update for some other reason

question

After examining the output below. Why cant router 1 and router 2 form neighbors and exchange updates. R1 R2 int Eth0 int Eth0 ip address 10.1.1/24 ip address 10.1.2.2/24 ip address 10.1.1.2/24 secondary router eigrp 4 router eigrp 4 network 10.0.0.0 network 10.0.0.0 end end

answer

EIGRP cannot form neighbor relationship and exchange routing updates with a secondary address

question

A network engineer notices that transmission rates of senders of TCP traffic sharply increase and decrease simultaneously during periods of congestion. What condition causes this?

answer

global synchronization?

question

Based on the following output of R2 which EIGRP external routes will be present in the routing table of R1

answer

Routes originating form the RIP routing domain

question

A network engineer finds that a core router has crashed without warning. In this situation which feature can the engineer use to create a crash collection?

answer

core dumps

question

What happens when the router stops receiving advertisements for the 10.1.2.0 network? sh ip route D 10.1.2.0/24 [90/10537472] via 10.1.1.2, 00:23:24, serial 1 D 10.0.0.0/8 is a summary, 00:23:20, Null0

answer

The summary route will remain in the table

question

Route enterprises has many stub networks in their enterprise network. What configuration can be done so that neither the prefix for the s0/0/0 interface nor the prefixes form router B appear in the routing tables for the router in the enterprise network?

answer

Use a mask with the network command to exclude interface s0/0/0

question

A company's corporate policy has been updated to require that stateless 1 to 1 and Ipv6 translation at the Internet edge are performed. What is the best solution to ensure compliance with this new policy?

answer

NPTv6 (explanation) The NPTv6 support on ASR1k/CSR1k/ISR4k feature supports IPv6-to-IPv6 Network Prefix Translation (NPTv6) which enables a router to translate an IPv6 packet header to IPv6 packet header and vice versa. The IPv6-to-IPv6 Network Prefix Translation (NPTv6) provides a mechanism to translate an inside IPv6 source address prefix to outside IPv6 source address prefix in IPv6 packet header and vice-versa. A router that implements an NPTv6 prefix translation function is referred to as an NPTv6 Translator.

question

What are 3 characteristics of EIGRP feasible successors?

answer

1.a FS is selected by comparing the AD of a non successor route to the Feasible distance of the best route 2. IF the AD of the non-successor route is less thant the feasible distance of the best route, then that route is identified as a feasible successor 3. If the successor becomes unavailable. then the feasible successor can be used immediately without recalculating for lost route

question

Which three problems result from application mixing up of UDP of TCP streams within a network with no Qos? (choose 3)

answer

1. Starvation 2.Latency 3. Lower throughput

question

A network engineer has been asked to ensure that the PPPoE connection is established and authenticated using an encrypted password. Which technology, in combination with PPPoE, can be used for authentication in this manner?

answer

CHAP

question

EIGRP has been configured to operate over Frame Relay multipoint connections. What should the bandwidth command be set to?

answer

The CIR of the lowest speed connection multiplied by the number of circuits

question

All Eigrp load balancing parameters are set to their defaults. You want to use all the routes in the EIGRP topology for ip load balancing. Which two EIGRP subcommands would you use to accomplish this goal?

answer

1. maximum-paths 2. variance

question

Router A(DR)failed, and after 10 minutes it came back. Which two statements are true?

answer

1. Router A is a Drother 2. Router B is a DR

question

which prefix is matched by the command ip prefix-list name permit 10.8.0.0/16 ge24 le24

answer

10.8.0.0/24

question

A user is having issues accessing file shares on a network. The network engineer advises the user to open a web browser and input a prescribed IP address and follow the instructions. After doing this the user is able to access company shares. Which type of remote access did the engineer enable?

answer

SSL VPN client access

question

______________ provides secure SSL connections to the security appliance for remote users. Without a previously installed client, remote user enter the IP addres in their browser of an interface configured to accept ______________ connections.

answer

SSL VPN

question

Based on the output below which statements are true? R1# sh ip route gateway of last resort is 10.1.1.2 to network 0.0.0.0 (learn how to find each of these in output) D EX 0.0.0.0/0

answer

1. A default route has been redistributed into EIGRP autonomous System 2. R1 is configured with the variance command 3. R1 is configured with the ip-summary address command

question

On all routers in the network, EIGRP has been configured for load balancing across the three links. However traffic destinded for network B from R1 is only load balanced over 2 paths. What is the cause of the problem?

answer

Because R4 is not a feasible successor, EIGRP will not select path R1-R4-R5 for load balancing

question

IN EIGRP the neighbors advertised distance must be less than the feasible distance of the current successor to be considered a _________

answer

feasible successor

question

A network engineer executes the show crypto ipsecsa command. Which three pieces of information are displayed in the output?

answer

1. inbound crypot map 2. remaining key lifetime 3. path MTU

question

What statement is true about the PPP session Phase of PPPoE? PPP options _______1_________ and ______________2___________ is performed. Once the link setup is completed,PPOE functions as a layer_____3_____ encapsulation method that allows data to be transferred over the ____4____ link with _____5_____ headers

answer

1.negotiated 2.authentication is performed. Once the link setup is co 3. 2 4. PPP link 5.PPPoE headers

question

After you review the output of the command show ipv6 interface brief you see that several IPv6 address have the 16-bit hexadecimal value of "FFFE" inserted into the address. Based on this information, what do you conclude about these IPv6 addresses?

answer

IEEE EUI-64 was implemented when assigning IPv6 addresses on the device.

question

You have been asked to configure R1 so that a default route is generated to its downsteam neighbors 191.0.0.1 and 192.0.0.2. Which commands would create this configuration?

answer

router eigrp 190 redistribute static ! ip route 0.0.0.0 0.0.0.0 Null0

question

After a recent DOS attack on a network, Senior management asks you to implement better logging functionality on all IOS-based devices. Which two actions can you take to provide enhanced logging results?

answer

1. Use the msec option to enable service time stamps 2. Increase the logging history

question

Based on this FIB table, which statement is correct?

answer

The gateway of last resort is 192.168.201.1

question

A corporate policy requires PPPoE to be enabled and to maintain a connection with the ISP, even if no interesting traffic exists. Which feature can be used to accomplish this task?

answer

Dialer Persistent

question

A network admin uses IPSLA to measure UDP performance and notices that packets on one router have a higher one-way delay compared to the opposite direction. Which UDP characteristic does this scenario describe?

answer

Latency

question

What type of route filtering is occurring on R6?

answer

Distribute-list using an ACL

question

Which EIGRP packet statement is true?

answer

Update packets route reliable change information only to the affected routers

question

You are a network engineer with ROUTE.com, a small IT company. They have recently merged two organizations and now need to merge their networks. One network is using OSPF as its IGP and the other is using EIGRP as its IGP. R4 has been added to the existing OSPF network to provide the interconnect between the OSPF and EIGRP networks. Two links have been added that will provide redundancy. The network requirements state that you must be able to ping and telnet from loopback 101 on R1 to the OSPF domain test address of 172.16.1.100. All traffic must use the shortest path that provides the greatest bandwidth. The redundant paths from the ospf network to the EIGRP network must be available in case of a link failure. No static or default routing is allowed in either network. You must meet these requirements without changing any existing configuration commands. You can only add or change default values.

answer

1. Find out 5 parameters(bandwidth,Delay ,reliability, Load,MTU) of the interface of R2 connected to R4 for redistribution: R2# Sh int s0/0/0 write down these 5 parameters, notice that we have to divide the Delay by 10 because the metric unit is tens of a microsecond. For example we get BW=1544kbit,Delay=20000 us,Reliability=255, Load=1, MTU=1500 bytes NOW redistribute as follows: R2# conf t router ospf 1 redistribute eigrp 100 metric-type 1 subnets exit router eigrp 100 redistribute ospf 1 metric 1544 2000 255 1 1500 exit copy run start Note: these parameters are just for reference we can use other parameters with no problem. If the delay is 20000 us then just divide it by 10, that is 20000/10=2000 NOW we must learn R3's parameters R3# sh int fa0/0 BW=10000 kbit, Delay=1000 us, Reliability= 255, Load= 1, MTU=1500 bytes R3# config t router ospf 1 redistribute eigrp 100 metric-type 1 subnets exit router eigrp 100 redistribute ospf metric 10000 100 255 1 1500 copy run start Note: once again divide delay 1000/10=100 Finnaly you should try to "show ip route to see the 172.16.100.1 network (the network behind R4) in the routing table of R1 and make a ping from R1 to this network. NOTE: if the link between R2 and R3 is FastEthernet link, we must put the command below under EIGRP process to make traffic form R1 to go through R3(R1-R2-R3-R4) which is better than R1-R2-R4 R2#conf t router eigrp 100 distance eigrp 90 105 This command sets the AD of all EIGRP internal routes to 90 and all EIGRP external routes to 105, which is smaller thant the AD of OSPF (110) now the link between R2-R3 will be preferred to the serial link between R2-R4. REMEMBER to copy run start everything!

question

The Cisco SA 500 series Security Appliances are built specifically for businesses with less than 100 employees. What are three important benefits of this device?

answer

1. business-grade firewall 2. site-to site VPN for remot offices 3. email security

question

What is the purpose of the autonomous-system number command?

answer

It sets the EIGRP autonomous system number in a VRF

question

Which encapsulation supports an interface that is configured for an EVN trunk?

answer

802.1Q

question

Router B should advertise the network connected to the E0/0/0 interface to router A and block all other network advertisements. The IP routing table on Router A indicates that it is not receiving this prefix form router B. What is the cause of the problem? RouterB# debug ip eigrp route Events debugging is on 192.168.3.16/28-denied by distribute list 192.168.3.32/28-denied by distribute list

answer

An access list on router B is causing the 192.168.3.16/28 network to be denied

question

Which statement about the output of the show flow-sampler command is true? Sampler: mysampler, id: 1, packets matched: 10 mode: random sampling mode

answer

The sampler matched 10 packets, each packet randomly chosen from every group of 100 packets.

question

Review the EIGRP authentication. Is anything missing? Key chain fred key 3 key-string whehew interface fa0/0 ip authentication key-chain eigrp 9 fred

answer

The configuration is mission one authentication-related configuration command

question

Which feature helps to maintain a PPoe connection with the ISP?

answer

Dialer Persistent

question

A router has an interface configured with ipv6 address autoconfig and also has a link-local address assigned. Which message is required to obtain a global unicast address when a router is present?

answer

router-advertisement

question

What are tow possible causes for EIGRP SIA routers?

answer

1. Some query or reply packets are lost between the routers 2. A failure causes traffic on a link between two neighboring routers to flow in only one direction (unidirectional link)

question

You want the redistributed EIGRP AS 19 routes to have an administrative distance of 121 when they appear as RIP routes in the routing table of A1. Which command should you use on a router to accomplish this goal?

answer

distance 121 10.1.1.6 0.0.0

question

Eigrp has been configured on router D. Router C is perform mutual redistribution between EIGRP and OSPF . You discover that while router C has hall of the EIGRP routes in its routing table, router A does not have any routes from the EIGRP domain. What on router c may be the cause of this?

answer

The subnets keyword was not included in the redistribute command under router ospf 1.

question

During the redistribution process configured on RTA, some of the EIGRP routes such as 10.1.1.0/24 and 10.2.2.0/24 are not being redistributed into the ospf routing domain. Which two items could be the solution to this problem?

answer

1. Change the Eigrp AS number from 100 to 1 in the redistribute command 2. Add the subnets option to the redistribute command

question

Which additional command is needed to redistribute IGRP into EIGRP? Router eigrp 123 Network 10.10.10.0 Now auto-summary ! Router igrp 123 Network 172.16.0.0 Network 172.17.0.0

answer

None, Eigrp and IGRP are automatically redistributed in this instance

question

Which three statements are true about EIGRP operation ?

answer

1. When summarization is configured, the router will also create route to null 0 2. Summarization is configured on a per-interface level. 3. Automatic summarization across major network boundaries is enabled by default

question

Name 2 incorrect statements about EIGRP

answer

1. Not correct) The summary route remains in the route table, even if there are no more specific routes to the network 2. Not correct)metric for the specific routes is used as the metric for the summary route

question

Which two statements about the Eigrp Dual Process are correct?

answer

1. An eigrp route will go active if there are o successors in in the EIGRP topology table 2.The stuck in active state is caused when the wait for the query replies have timed out

question

What are some WRONG statements about the EIGRP DUAL process?

answer

1. WRONG-An eigrp route will go passive if there are no successors in the EIGRP topology table 2. WRONG-DUAL will trigger an Eigrp query process while placing the flapping routes in the holddown state 3. WRONG-Afeasible successor in the EIGRP topology table can become the successor only after all the query request have been replied to. 4. WRONG-queries are sent during th loading state in the EIGRP neighbor establishment process.

question

What are 3 key concepts that apply when configuring the Eigrp stub routing feature in a hub and spoke network?

answer

1.only remote routers are configured as stubs. 2.Stub routers are not queried for routes 3.Astub router should have only EIGRP hub routers as neighbors

question

Which two EIGRP routes will be seen in the routing table 10.10.10.0/24 172.16.10.10 router eigrp 4 network 10.0.0.0 network 172.16.0.0 auto-summary

answer

10.10.10.0/24 and 172.16.0.0/16

question

EIGRP had converged in AS1 when the link between R1 and R2 went down the console on R2 generated the following messages: neighbor 10.1.4.3 serial 0 is down stuck in active(this is router 3) Route 10.1.1.0/24(this is router 2)

answer

Router 3 didnt not reply to the query about network 10.1.1.0/24 sent by router R2

question

EIGRP _______________________ route reliable change information only to the _________________________

answer

1. Update packets 2. Affected routers

question

During a redistribution of routes form OSPF to EIGRP , an administrator notices that none of the OSPF routes are showing in EIGRP why?

answer

1. incorrect distribute lists have been configured 2.no default metric configured for EIGRP

question

Which 3 statements are true about EIGRP route summarization?

answer

1. Manual route summarization is configured on the interface 2. The ip sumary-address eigrp command generates a default route with an administrative distance of 5 3. When manual summarization is configured, the router immediately creates a route that points to null 0 interface

question

EIGRP Both outgoing and incoming routing updates from external router to this type of interface will be stopped because of what configuration?

answer

passive interface serial 0/0/

question

What does the default value of the EIGRP variance command of 1 mean?

answer

The router performs equal-cost load balancing

question

Based on the following output what is true? router eigrp 4 network 10.0.0.0 network 172.16.0.0 eigrp stub redistribute connected auto-summary

answer

1. Router will advertise connected and summary routes only 2. The eigrp stub command prevents queries form being sent to this router

question

Which command can be issued on a router to verify that automatic summarization is enabled?

answer

show ip protocols

question

Which address best summarizes the IPv6 addresses 2001:DB8:ACAD::/48, 2001:DB8:9001::/48, and 2001:DB8:8752::/49? 2001:DB8:8000::/48 2001:DB8:8000::/36 2001:DB8:8000::/47 2001:DB8:8000::/34

answer

2001:DB8:8000::/34

question

Router R3 is receiving multiple routes through the EIGRP routing protocol. Which statement is true about the implementation of summarization in this network?

answer

Automatic summarization is disabled on R3

question

Refer to the exhibit. Considering that R2, R3, and R4 are correctly configured, why did R1 not establish an adjacency with R2, R3, and R4

answer

because the Fa0/0 interface of R1 is declared as passive for EIGRP

question

In which IOS CLI mode must a network administrator issue the maximum-paths command to configure load balancing in EIGRP??

answer

router configuration mode

question

Two routers, R1 and R2, have established an EIGRP neighbor relationship, but there is still a connectivity problem. Which issue could be causing this problem?? a process ID mismatch an authentication mismatch an access list that is blocking advertisements from other networks automatic summarization that is disabled on both routers 7

answer

an access list that is blocking advertisements from other networks

question

Refer to the exhibit. Remote users are experiencing connectivity problems when attempting to reach hosts in the 172.21.100.0 /24 network. Using the output in the exhibit, what is the most likely cause of the connectivity problem? The GigabitEthernet 0/1 interface is not participating in the EIGRP process.* The hello timer has been modified on interface GigabitEthernet 0/1 of R3 and not on the neighbor, causing a neighbor adjacency not to form. The passive-interface command is preventing neighbor relationships on interface GigabitEthernet 0/0. The GigabitEthernet interfaces are not limiting the flow of EIGRP message information and are being flooded with EIGRP traffic.

answer

The GigabitEthernet 0/1 interface is not participating in the EIGRP process.*

question

In which scenario will the use of EIGRP automatic summarization cause inconsistent routing in a network?

answer

when the routers in an IPv4 network are connected to discontiguous networks with automatic summarization enabled

question

Refer to the exhibit. Routers R1 and R2 are directly connected via their serial interfaces and are both running the EIGRP routing protocol. R1 and R2 can ping the directly connected serial interface of their neighbor, but they cannot form an EIGRP neighbor adjacency.

answer

Configure both routers with the same EIGRP process ID

question

Refer to the exhibit. Which statement accurately reflects the configuration of routing on the HQ router?

answer

A static default route was configured on this router

question

Which statement is supported by the output: "Gateway of last resort is 192.168.12.1 to network 0.0.0.0"

answer

A default route is being learned through an external process

question

Which statement is supported by the output: Gatway of last resort is 0.0.0.0 to network 0.0.0.0

answer

A static default route was configured on this router

question

Which of the following is the shortest valid abbreviation for FE80:0000:0000:0000:0010:0000:0000:0123?

answer

Answer: FE80::10:0:0:123 Inside a quartet k, any leading 0s can be omitted and one seq2uence of one or more quartets of all0s can be replaced with :: the correct annswer replaces the longer three-quartet sequence of 0s with ::

question

An ISP has assigned prefix 3000:1234:5678::/48 to company 1. Which of the following terms would typically be used to describe this type of publickIPv6 prefix?

answer

Answer :Global routing Prefix

question

Which of the following answers list either a protocol or function that can be used by a host to dynamically learn its own IPv6 address?

answer

Answer: Stateful DHCP, Stateless autoconifguration

question

IN IPV6 _______________ supplies the DNS server Ip addresses, and __________ supplies layer 2 mapping information

answer

1.Stateless DHCP 2.NDP

question

Which of the following is helpful to allow an IPv6 host to learn the Ip address of a default gateway on its subnet?

answer

Neighbor Discovery Protocol

question

What does a IPV6 multicast address look like?

answer

FF80::1:1234:5678:9ABC Multicast Ipv6 addresses begin FF00::/8 the first two hex digits are "F"

question

Router R1 has the following config. Assuming that R1/s F0/0 interface has a Mac address of 0200.0011.1111 what IPv6 addresses will R1 list for the interface F0/0 in the following output? interface f0/0 ipv6 address 2345:0:0:8::1/64

answer

1. 235:0:0:8::1 2. FE80::FF:FE11:1111 Because there is no eui-64 parameter R1 does not form its global unicast address using the EUI-64 format. However it does form its link-local address using EUI-64. The show ipv6 brief command lists both the global unicast and link-local addreses in its output.

question

Router R1 lists the following output from a show command. Which of the following is true about R1? Fastethernet0/0 is up , line protocol is up Ipv6 is enabled, link-local address is FE80::213:19FF:FE12:3456 No virtual link-local addresses (es): Global unicast address (es): 2000:4:213:19FF:FE12:3456, subnet is 2000:0:0:4::/64 [EUI] Joined group address (es): FF02::1 FF02:: 2 FF02::1FF12:3456

answer

R1/s solicited node multicast address is FF02::1FF12:3456

question

Rouoters R1 and R2 are Eigrp neigbors using Fa0/o interfaces, An engineer adds the ip hello-interval eigrp 9 6 command to R1's FA0/0 configuration. Which of the following is true regarding the results from this change?

answer

The show ip eigrp interfaces detail command on R1 lists the revised Hello timer

question

Router R1 has been configured with the commands router eigrp9 and network 172.16.2.0 0.0.0.255, with no other current EIGRP configuration. When the engineer attempts to add the neighbor 172.16.2.0 fa0/0 command in EIGRP config what happens?

answer

The neighborship fails and then reestablishes

question

In EIGRP What command enables MD5 authentication rather than the default of no authentication

answer

ip authentication mode eigrp asn md5

question

A company has Frame Relay WAN with one central-site router and 100 branch office routers. A partial mesh of PVc's exists: Which of the following could be true about the number of EIGRP neighborships?

answer

A partial mesh totaling 100: one between the central-site router and each of the 100 branches

question

Which of the following are methods that EIGRP uses to initially populate(seed) its EIGRP topology table, before learning topology data from neighbors?

answer

1. By adding the subnets of working interface over which static neighbors have been defined 2. By adding subnets redistributed on the local router from another routing source

question

Which of the following are both advertised by EIGRP in the Update message and included in the formula for calculating the integer EIGRP metric?

answer

1. Delay 2.Reliability

question

Router R1 uses s0/0 to connect through a T/1 to the frame relay service. Five PVC's terminate on the serial link. Three PVC/s 101,102,103 are configured on subinterface s0/0.1 and one each 102 and 105 are on s0/0.2 and s0/0.3 The configuration shows no bandwidth related commands. with no bandwidth command configured How will Cisco IOS try to limit EIGRP's use of bandwidth on S0/0?

answer

Answer: R1 limits Eigrp to around 250 kbps on DLCI 102 EIGRP perfoms WAN Bandwidth control without any explicit configuration, using default settings. Because no BW commands have been configured, each subinterface uses the default 1544-kbps setting . For s0/0.1 Wan BW control divides the 1544 by 3 (515)and then takes the (default) WAN BW of 50% meaning 250kbps for each of the three DLCI's

question

The output of sh ip eigrp topology on Router R1 shows the following output, which is all the output related to subnet 10.11.1.0/24. How many feasible successor routes does R1 have for 10.11.1.0/24? P 10.11.1.0/24, 2 successors, FD is 2172419 via 10.1.1.2 (2127423/28167) , serial 0/0/0.1 via 10.1.1.6 (2172423/28167), serial 0/0/0.2

answer

Answer: No feasible successors This command lists all successor and feasible successor routes. The output states that two successors exist, and only two routes (listed with the via text) exist. So no feasible successor routes exist

question

A network design shows that R1 has four different possible paths from itself to the data center subnets. What can influence which of those routes become feasible successor routes, assuming that you follow the cisco recommended practice of not changing metric weights?

answer

1. The configuration of EIGRP offset lists 2.CHanging of interface delay settings

question

Router R1 is three router hops away from subnet 10.1.1.0/24. All three links between R1 and 10.1.1.0/24 use the following settings: BW(inkbps:1000, 500, 100000) and delay (in microseconds: 12,000 ,8000, 100. Which of the following answers identify a value that feeds into the EIGRP metric calculation?

answer

1. Bandwidth of 500 kilobits per second 2. Delay of 2010 tens-of-microseconds Eigrp takes the lowest bandwidth in , kbps, which is 500kbps. For delay, Eigrp takes the cumulative delay , which is 20100 per the various sho intefaces commands. However sh interfaces uses a unit of microseconds, and the interface delay command and the EIGRP formula us a unit of tens-of microseconds, making the delay that feeds into the formula be: 2010

question

Routers R1 and R2 are EIGRP neighbors. R1 has been configured with the eigrp stub connected command. Which of the following are true as a result?

answer

1. R2 can no longer learn EIGRP routes from R1 for routes not connected to R1 2.R2 no longer sends Query messages to R1

question

Router R1 lists four routes for subnet 10.1.1.0/24 in the output of the show ip eigrp toplogy all-links command. The variance100 command is configured but no other related commands are configured. Which of the following rules is true regarding R1's decision of what routes to add to the Ip routing table? (note that RD refers to reported distance and FD to feasible distance)

answer

It adds all successor and feasible successor routes for which the metric is <=100 the best metric among all routes

question

What EIGRP commands is most likely to show all the possible next-hop IP addresses for specific routes?

answer

show ip eigrp topology all-links

question

Router R1 has been configured for EIGRP. The configuration also includes an ACl with one line- access-list 1 permit 10.10.32.0 0.0.15.255 and the configuration includes the distribute-list 1 in command. Which of the following routes could not be displayed in the output of the the show ip eigrp topology command as a result?

answer

10.10.48.0/23 and 10.10.60.0/30 The ACL permits numbers in the range 10.10.32.0-10.10.47.255 which leaves .48 and .60 un matched by the permit clause

question

What will be filtered here? sh ip prefix-list ip prefix-list question: 3 entries seq 5 deny 10.1.2.0/24 ge 25 le 27 seq 15 deny 10.2.0.0/16 ge 30 le 30 seq permit 0.0.0.0/0

answer

10.1.2.224/26 will be filtered because of clause 5 10.2.2.4/30 will be filtered because of clause 15 0.0.0.0/0 will be permitted

question

R1 has correctly configured EIGRP to filter routes using a route map named question. The configuration that follows shows the entire route map and related configuration. How will prefix 10.10.10.0/24 be affected? route-map question deny 10 match ip address 1 route-map question permit 20 match ip address prefix-list fred ! access-list 1 deny 10.10.10.0 0.0.0.255 ip prefix-list fred permit 10.10.10.0/23 le 25

answer

It will be permitted because of matching clause 20's reference to prefix list fred By not matching acl 1 with a "route-map" permit Eigrp does not consider a match to have occurred with clause 10 so it moves to clause 20.

question

Which of the prefix-lists could match a subnet whose prefix length is 27?

answer

ip prefix-list barney permit 10.0.0.0/24 le 28 ip prefix-list Wilma permit 10.0.0.0/24 ge25

question

What is wrong with this prefix-list? ip prefix-list fred permit 10.0.0.0/24 ge 16 le 28

answer

This is invalid the ge value must be larger than/24 . The command is rejected

question

AN engineer plans to configure summary routes with the ip summary-address asn prefix mask command. Which of the following, when added to such a command, would create a summary that includes all four of the following subnets: 10.1.100.0/25 10.1.101.96/27 10.1.101.224/28 10.1.100.128/25

answer

10.1.64.0 255.255.192.0 /18 This implies a range of 10.1.64.0-10.1.127.255 which includes all subnets

question

R1 has routes for subnets 10.1.1.0/24. An engineer adds the ip summary-address eigrp 1 10.1.0.0 255.255.0.0 command to interface fa0/0 . What will happen?

answer

R1 no longer advertises 10.1.1.0/24 to neighbors connected to FA0/0

question

In a lab R1-R2-R3 which of the following combinations of the auto-summary config on EIGRP will result in R1 seeing a summarized route?

answer

1.auto-summary on R2 and auto summary on R3 2.no auto-summary on R2 and auto summary on R3

question

Router R1 exists in an enterprise that Uses EIGRP as its routing protocol. The show ip route command output on ROuter R1 lists the following phrase: "gateway of last resort is 1.1.1.1 to network 2.0.0.0" What command caused this output to occur?

answer

ip default-network 2.0.0.0

question

Enterprise Router R1 connects to an enterprise to the internet. R1 needs to create and advertise a default route into the enterprise using EIGRP. The engineer creating the implementation plan has chosen to base this default route on the ip route command, rather than using ip default-network. What approach need to be take with this?

answer

With the suggested config style the static route must first be configured statically as shown. Then, either this route must be redistributed as a static route in EIGRP or pulled into EIGRP by virtue of the network 0.0.0.0 EIGRP sub command.

question

Integer metric for the route, from the local routers perspective, used by the local router to choose the best route route that prefix

answer

Feasible Distance

question

This is the integer metric for the route, from the neighboring router's perspective(the neighbor that told the local router about the route)

answer

Reported Distance

question

What functions can an EIGRP offset list perform?

answer

1. Match prefixes/prefix length using an IP acl so that the offset is applied only to routes matched by the ACL with a permit clause 2. Match the direction of the Update message, either sent(out) or received (in) 3. Match the interface on which the Update is sent or received 4. Set the integer metric added to the calculation for both the FD and RD calculations for the route

question

OFFSET-LISTS WAN 1 has calculated a metric of 2,172,416 for its route through B1 to subnet 10.11.1.0/24. ROuter B1 calculatd a value of 28,160 for the RD of the same direct route. After the addition of the following offset list on WAN1 what will happen to this metrics? access-list 11 permit 10.11.1.0 router eigrp 1 offset-list 11 in 3 serial 0/0/0.1 end

answer

The access-list 11 matches prefix 10.11.1.0 and that prefix only, with a permit clause. The offset-list 11 "in" 3 s0/0/0.1 command tells Router Wan 1 to examine all EIGRP updates received on that interface and if prefix 10.11.1.0 is found add 3 to the computed FD and RD fort that prefix example Wan 1 FD is now :,172,416+3=2,172,419 Router B1 RD is now: 28160+3=28163

question

A network admin executes the command clear ip route. Which two tables does this command clear and rebuild?

answer

1. Ip routing 2. FIB

question

Which switching method is used when entries are present in the output of the command sh ip cache?

answer

Fast switching

question

Which two actions must you perform to enable and use window scaling on a router?

answer

1. Execute the command iptcp window-size 65536 2. Set window scaling to be used on the remote host

question

Under which condition does UDP dominance occur ?

answer

when TCP traffic is in the same class as UDP

question

Prior to enabling PPPoe in a virtual private dialup network group which task must be completed?

answer

Execute the vpdn enable command

question

Which protocol uses dynamic address mapping to request the next-hop protocol address for a specific connection?

answer

Frame Relay inverse ARP

question

What is the default OSPF hello interval on a Frame Relay point-to-point network?

answer

10

question

PPPoE is composed of which two phases?

answer

Active Discovery phase and PPP Session Phase

question

An engineer has configured a router to use EUI-64, and was asked to document the IPv6 address of the router. The router has the following interface parameters: mac address C601.420F.0007 subnet 2001:DB8:0:1::/64 Which Ipv6 addresses should the engineer add to the documentation?

answer

2001:DB8:0:1:c601:42FF:FEof:7

question

A packet capture log indicates that several router solicitation messages were sent from a local host on the IPv6 segment . What is the expected acknowledgement and its usage?

answer

Routers on the IPv6 segment will respond with an advertisement that provides an external path from the local subnet, as well as certain data such as prefix discovery.

question

Router R1, R2 & R3. Router R2 has Network 10.10.10.0/24. All are in Eigrp domain. From R1, we have two path to reach reach 10.10.10.x subnet. R1->R2 (Directly) & R1->R3->R2. I have to share data on 5:1 ratio, how we can do it. R1(S0/0->256kbs)-> R2 (S0/0->256kbs) R1(S0/1->1.536Mbs)-> R3(S0/0->1.536Mbs) R3 (S0/1->1.28Mbs)-> R2(S0/1->1.28Mbs

answer

EIGRP metric with default K values is proportional to the sum of delays (in tens of microseconds 1 msec = 100 tens of microseconds) and to the inverse of the lowest BW in path expressed in kbps. path1 = 256 * (Delay of s0/0 in tens of microseconds) + 256 * 10^7/256 path2 = 256 * (Delay_R1_s0/1+ Delay_R3_s0/1) + 256 * (10^7 / 1280) lowest BW on path 2 is 1280 kbps. you can get the delay parameters from sh int serx/y on the routers. The best path is path2, path1 provides a feasible successor so you can use the variance command R1: router eigrp xx variance 6 you may need to tune the interface parameters delay and BW to get a 5:1 ratio between the two metrics.

question

The __________ is multiplied by the current Feasible distance

answer

Variance

question

Any feasible successor routes whose calculated metric is less than or equal to the product of variance and Feasible distance are added to the ip routing table assuming that the_______________ setting allows more routes

answer

maximum-paths

question

EIGRP routes that are neither ___________ nor _____________ can never be added to the IP routing table regardless of the variance setting

answer

successor feasible successor

question

What command can determine what percent of a router interfaces BW EIGRP is allowed to use?

answer

sh interface

question

What Eigrp commands can determine a specific type of route filtering being used?

answer

sh ip protocols

question

IN EIGRP What command can determine the (reported or advertised) distance for a specific network on a router?

answer

sh ip eigrp topology 10.11.1.0/24 composite metiric is (Feasible distance/AD-RD)

question

A company has just just opened two remote branch offices that need to be connected to the corporate network. Which interface configuration output can be applied to the corporate router to allow communication to the remote sites?

answer

interface Tunnel0 bandwidth 1536 ip address 209.165.200.230 255.255.255.224 tunnel source serial0/0 tunnel mode gre multipoint

question

Which three characteristics are shared by subinterfaces and associated EVNs?

answer

1. IP address 2.routing table 3. Forward table

question

Which Cisco IOS VPN technology leverages IPsec, mGRE, dynamic routing protocol, NHRP and Cisco Express Forwarding?

answer

DMVPN

question

For trouble shooting purposes, which method can you use in combination with the debug ip packet command to limit the amount of output data?

answer

You can use an extended access list

question

What are the tree modes of Unicast Reverse Path Forwarding?

answer

strict mode, loose mode , and VRF mode

question

Cisco IOS uses the _________1__________ command plus one or more__________2_________net-id wildcard-mask subcommands to enable EIGRP on the router and on router interfaces.

answer

1.router eigrp 2. network

question

Cisco IOS only enables EIGRP on ____________________ matched by an EIGRP network command.

answer

interfaces

question

Once interfaces are matched by and EIGRP network command, the router does what 2 things?

answer

1. Attemps to discover EIGRP neighbors on that interface by sending multicast EIGRP hello messages 2. Advertises to other neighbors about the subnet connected to the interface

question

If no _____________________ is configured on the EIGRP network command, the command enables EIGRP on all of that router's interfaces directly connectec to the configured CLASSFUL network.

answer

wildcard mask

question

If the _____1_______ command includes a _______2_________ the router performs ACL logic when comparing the net-id configured in the network command with each interface's IP address, using the configured wildcard mask as an ____3_____ wild card mask.

answer

1.network 2.wildcard mask 3.ACL

question

How do you confirm what interfaces EIGRP has been enabled on?

answer

Sh ip eigrp interfaces

question

How do you perform EIGRP verification ? Also what commands are used? 1.sh ip eigrp interfaces 2. sh ip protocols, sh ip eigrp neighbors 3.sh ip eigrp toplogy 4. sh ip route

answer

Note: make sure to check for (working) elements 1. verify (working) EIGRP interfaces are they up? 2.verify eigrp (working) neighbors are they up? 3.verify eigrp topology table(subnets) are they there? 4. Lists EIGRP-learned routes with a code of "D" on the left side of the output

question

what EIGRP command shows this Output: Interface Peers un/reliable Mean Pacing time Multicast flowtime Fa0/0 0/0 se0/0/o 1 0/0

answer

sh ip eigrp interfaces

question

what EIGRP command shows this output? EIGRP metric weight K1=1,k2=0,k3=1, k4=0,K5=0 EIGRP maxmum metric variance 1 routing for networks: 10.1.2.2/32 Routing information sources

answer

sh ip protocols

question

What are the 3 major steps Eigrp takes to learn the best available loop-free routes?

answer

1. Establish EIGRP neighbor relationships with other routers that share a common subnet 2. Exchange EIGRP topology data with those neighbors 3. Calculate the currently best IP route for each subnet, based on the known EIGRP topology data and add those best routes to the IP routing table

question

The word __________________ defines the overall process where routers notice internetwork topology changes, communicate about those changes, and change their routing tables to contain only the best currently working routes.

answer

Convergence

question

What commands should be used to verify Successor and feasible successor routes?

answer

1.sh ip eigrp topology-lists only successor and feasible successor routes sh ip eigrp topology all-links: lists all possible routes , including those that are neither successor nor feasible successor routes

question

OK check this out ELi we have a scenario wher Wan1 has 3 options for routing to the 10.11.1.1 subnet. Yet when you run a ship eigrp toplogy which shows you only successor and feasible successor routes you will see the following output: P 10.11.1.0/24, 1 successors, FD is 217416 via 10.1.1.2 (2172416/28160), Serial 0/0/0.1 Now Eli the goal here is to create a feasible successor route utilizing another link. What command will we use to discover other links?

answer

sh ip eigrp toplology all-links This command shows us : P10.11.1.0/24, 1 successors, FD is 2172416, serno 45 successo 10.1.1.2 (FD)217416/(AD/RD)28160), Serial 0/0/0.1 2ndoption via 10.9.1.2 (FD)2174976/(AD/RD)2172416), fastethernet 0/0 N we can see we have a 2nd option for a FS. NOw we must make 10.9.1.2 a FS by manipulating the RD/AD=2172416 Why? because it now equals the successors FD . As a rule TO BE AN FS route RD must be less than the FD of the successor. Manipulate the metric: goal here is to either lower the 2nd options RD or increase the successors FD HOW? You can use an offset-list example: conf t access-list 11 permit 10.11.1.0 router eigrp 1 offset-list 11 in 3 s0/0/0.1(this will increment successors FD by 3 notice we are on the successors subinterface 0/0/0.1!) depending on which routers metric choose the appropriate interface! NOW run the sh ip eigrp topology and you will see both the Successor and FS with the successors metric increased by 3 example: sh ip eigrp topology p 10.11.1.0/24, 1 succesors, FD is 217419 via 10.1.1.2 217419/28163), serial0/0/0.1 FS ! via 19.9.1.2 (21741976/217476), Fa0/0

question

1.When Eigrp removes a successor route an no FS route exists what does the router do? 2.What happens to routes that have a successor and no failure has occurred?

answer

1.The router begins a process called "GOING ACTIVE" where discovers whether any loop-free alternative routes exist to reach that prefix. 2.Successor routes that have no failure remain in a Passive state (good state).

question

What are the steps taken for routes where no feasible successor routes exist and the routes exist moving into an active state? Acronym for this may help: C-Q-R-FQ-NR-RN-BLF

answer

C- change the state form passive (p) to active (a) Q- send eigrp query messages to every neighbor except the neighbor in the failed route. (It asks the neibor:DO you have a loop-free route?) R-Neighbor considers itself to have a loop-free route if it is passive (p) for that prefix-length.-1)Neighbor sends reply message that says"I have a loop-free route"2) Does not forward the query to anyone else FQ-If the neighbor is active (A) on the prefix it FLOODS the EIGRP query to its neighbors Waits on replies NR-Router receives replies from all neighbors its sent queries to RN-replies to neighbors that need it BLF-router chooses the best of the loop-free routes

question

eigrp stub connected

answer

Advertise connected routes but only for interfaces matched with a network command

question

eibrp stub connected summary

answer

Advertise auto-summarized or statically configured summary routes

question

Eigrp stub redistribute static

answer

Advertise static routes, assuming that the redistribute static command is configured

question

eigrp stub leak-map

answer

Advertise routes (that would otherwise be part of a summary route specified by a leakmap

question

eigrp stub redistributed

answer

Advertise redistributed routes, assuming that redistribution is configureed

question

Eigrp stub receive-only

answer

does not advertise any routes

question

Bandwidth 1544 kbps

answer

SERIAL interface

question

Bandwidth 1000,000 kbps

answer

Gigabitethernet interface

question

Bandwidth 100,000 kbps

answer

Fastethernet interface

question

Bandwidth 10,000 kbps

answer

Ethernet interface

question

DELAY 20,000 microseconds

answer

SERIAL interface

question

DELAY 10 microseconds

answer

Gigabitethernet interface

question

DELAY 100 microseconds

answer

Fastethernet interface

question

DELAY 1000 microseconds

answer

Ethernet interface

question

EIGRP metrics can be changed using which 4 methods?

answer

1. Setting the interface Bandwidth 2. Setting the interface delay 3.changing the metric calculation formula by configuring K values 4.Adding to the calculated metric with offset lists.

question

What is the most reasonable and commonly used method to tune EIGRP metrics?

answer

To set the interface delay and interface bandwidth

question

What is the unit for the bandwidth interface sub command?

answer

kilobits/second or kbps

question

What is the unit for the delay interface sub command?

answer

tens-of microseconds

question

If a design requires that you influence the choice of route by changing the BW or delay which is the better choice? and why?

answer

Changing the delay because this setting has little influence on other CISCO IOS features besides EIGRP . BW isn't as simple This is because cisco IOS uses the BW setting of an interface for calculating interface utilization affecting QOS parameters, and SNMP statistics reporting.

question

What happens if a router receives an EIGRP query for a prefix/prefixlength, and doesn't have an exact match , but does have a summary route that includes the prefix/prefix length?

answer

That router immediately sends an EIGRP reply and does not flood the query to its own neighbors

question

The ______________ refers to an ACL prefix list or routemap/ These tree tools classify whether a route should be permitted to be sent/received in an EIGRP update or be filtered.

answer

distribute-list

question

Which EIGRP filtering tools can be applied to a distribute list?

answer

1. prefix-list 2. route-map 3.ACL

question

IP prefix lists can examine both the prefix and prefix length and a range of prefixes or a range of prefix lengths. The command then sets either a ___________ or ____________ action for each matched prefix/length.

answer

deny or permit

question

What is the advantage of using IP prefix lists for route filtering vs distribute lists?

answer

They allow matching of prefix length, whereas the ACL's used by the EIGRP distribute-list command cannot. Many people find Ip prefix lists more intuitive for configuring route filtering.

question

What are the two mechanisms used by prefix lists to match components of an IP route?

answer

1. the Route prefix( the subnet number) 2. The prefix length ( the subnet mask)

question

What is the command syntax of a prefix-list?

answer

ip prefix-list {name} {seq#} {deny|permit subnet/mask} {ge} {le}

question

Prefix list The routes prefix length or(subnetmask) must match the ___________1____________ implied by the prefix-list commands__________2________ parameters

answer

1. range of prefixes 2. prefix-length or subnets mask ge and le parameters

question

Pre fix list The routes prefix must be within the _________________ implied by the prefix-list commands prefix/prefix-length parameters

answer

1. range of addresses

question

route-map commands with the _________ option either cause a route to be allowed through or remain in the list of routes to be examined by the next route-map clause

answer

permit

question

rout-map commands with the __________ option either filter the route or leave the route in the list of routes to be examined by the next route-map clause

answer

deny

question

What are the benefits of route summarization with EIGRP?

answer

1. smaller Routing tables, while all destinations are still reachable 2.Reduces Query scope: Eigrp query stops at a router that has a summary route that includes the subnet listed in the query but not the specific route listed in the query 3. EIGRP supports summarization at any location in the internetwork 4. The summary has the metric of the best of the subnets being summarized

question

What are the Trade-offs to summarization with EIGRP?

answer

1. it can cause suboptimal routing 2. Packets destined for inaccessible destinations will flow to the summarizing router before being discarded

question

what is the command syntax for EIGRP summarization?

answer

ip summary-address eigrp asn prefix subnet-mask

question

When eigrp summarization is configured on an interface how does the router change its logic for the EIGRP update messages sent out the interface?

answer

1. The router brings down and then back up all EIGRP neighbors reachable on that interface, effectively causing nighbors to forget previous topology information and to listen to new information(when neighbors recover) 2. When the neighborships recover the router advertises the summary route , per the ip summary-address command assuming that the router has at least one route whose range is inside the range of the summary route 3. The router does not advertise the subordinate routes(routes that fall within th summary range) 4. The router adds a route to its own routing table, for the summary prefix/prefixlengthl with an outgoing interface of null 0

question

When the EIGRP summarizing router receives a packet within the summary route's range what happens?

answer

1. If the packet matches a more specific route than the summary route, the packet is forwarded based on that route. 2.When the packet does not match a more specific route, it matches a summary route and is discarded

question

In EIGRP how does the router ensure it adds the local summary route?

answer

The router uses the administrative distance setting of 5.

question

1st OPTION EIGRP DEFAULT ROUTES: What are the steps to define a static default route for EIGRP to advertise it?

answer

1. Create a static route default route using the ip route0.0.0.0 0.0.0.0 s0/0/0 command 2. Inject this route into the EIGRP topology database either using the network 0.0.0.0 command or by redistributing the static route.

question

2nd OPTION EIGRP DEFAULT ROUTES: What are the steps to flag an existing route to be used also as a default route in EIGRP?

answer

This option flags a route for a classful netowrkfor a prefix that will be advertised into the EIGRP domain-as a route that can be used a s a default route. Then each router can use the forwarding details in that route -the outgoing interface and next hop router as its default route 1. On the router to which all traffic should be directed, identify a classful network that can be advertised into the EIGRP Domain, and ensure that network is being advertised into EIGRP( using the eigrp network command) 2. Configure that network as a default network using the global command ip default-network network number

question

EIGRP CONFIG: configure a default route using a loopback interface on router 1

answer

conf t interface loopback 8 ip address 192.31.7.1 255.255.255.0 router eigrp 1 network 192.31.7.0 exit ip default-network 192.31.7.0 copy run start sh ip route

question

What information is communicated by OSPF routers and held their LSDB's?

answer

1. The existence of and identifier for each router 2. Each router interface,IP address , mask and subnet 3. The list of routers reachable by each router on each interface

question

WHat is the OSPF link state database or LSDB?

answer

The data structure held by OSPF router for the purpose of storing topology data

question

SPF

answer

The name of the algorithm OSPF uses to analyze the LSDB.

question

OSPF: The analysis of the____________________ determines the best or lowest cost route for each Prefix/length in OSPF

answer

SPF algorithm

question

OSPF :WHat is the LSU?

answer

The name of the OSPF packet that holds the detailed topology information , specifically LSA's

question

OSPF: What is a LSA?

answer

THe name of a class of Ospf data structures that holds topology information .

question

OSPF: What are held in memory in a LSDB and communicated over network LSU messages?

answer

Link-state Advertisments

question

AREA

answer

Contiguous grouping of routers and router interfaces

question

AREA BORDER ROUTER

answer

A router that has interfaces connected to at least two different OSPF areas including the backbone area

question

OSPF: Which routers hold topology data for each area, calculate routes for each area, and advertise those routes between areas?

answer

ABR's

question

What is a backbone router?

answer

Any router that has at least one interface connected to the backbone area

question

What are internal routers?

answer

A router that has interfaces connected to only one area, making the router completely internal to that area

question

DESIGNATED router or DR

answer

ON multi-access data links like LANS, an OSPF router elected by the routers on that datalink to perform special functions. 1 . Generating LSA's representing the subnet 2. Playing a key role in the database exchange process

question

BDR

answer

A router on a multi-access data link that monitors the DR and becomes prepared to take over for the DR should it fail

question

What are the steps of ospf configuration

answer

router ospf {process id} network {net-id} wildcard-mask area

question

OSPF : neighboring routers do not have to be configured with the same________________ to be come neighbors.

answer

process id

question

CISCO IOS only enables OSPF on interfaces matched by an ospf _____________ command

answer

network

question

OSPF: To match an interface with the network command Cisco IOS compares the ___________ configured in the network command with each interfaces ip address. While using the configured wildcard mask as an ACL wildcard mask

answer

net-id

question

OSPF: Regardless of the order in which the network commands are added. CISCO IOS puts these commands into the config file with the_____________wildcard mask first.

answer

most specific(most binary 0's)

question

What 3 ways does OSPF use to determine router ID?

answer

1. Use the router ID defined in the router id z.z.z.z ospf router subcommand 2. Use the highest Ip address of any up loopback interface 3. Use the highest IP address of any up non loopback interface

question

What ospf verification command lists the interfaces on which OSPF is enabled. omitting passive interfaces

answer

sh ip ospf interface brief

question

What OSPF verification command lists the content of the network configuration commands for each routing process and a list of enabled but passive interfaces?

answer

sh ip protocols

question

What OSPF verification command lists known neighbors, including neighbors state,does not list neighbors for which some mismatched parameter is preventing a valid OSPF neighbor relationship

answer

sh ip ospf neighbors

question

What OSPF verification command lists all LSA's from all connected areas?

answer

sh ip ospf database

question

What OSPF verification command lists the contents of the IP routing table, listing OSPF learned routes with a code of O on the leftside of the output?

answer

sh ip route

question

What protocol type does OSPF use for transport UDP or TCP?

answer

Neither. IT uses protocol type 89 instead

question

What is the OSPF METRIC?

answer

Based on cumulative cost of all outgoing interfaces in a route. The interface cost defaults to a function of interface BW but can be set explicitly

question

What is the OSPF Hello Interval?

answer

Interval at which a router sends OSPF Hello messages out of an inteface

question

WHat is the OSPF DEAD interval?

answer

Timer used to determine when a neighboring router has failed. Based on a router not receiving any OSPF messages, including Hellos, in this timer period

question

BGP Autonomous systems

answer

Don't have to match for neighborships

question

BGP autonomous systems use ______

answer

Exterior Gateway protocols to exchange updates with other autonomous systems

question

routes that we learn via BGP are going to be ___________ from the ip routing table

answer

separate from you IP routing table

question

TO verify BGP connectivity we look at the BGP routing table for the _______________

answer

valid and best route

question

Routes can be taken from your BGP routing table and redistributed into your IGP table ospf or EIGRP and vice vers But________________

answer

You have to be EXTREMELY careful! Internet outages can occur if not properly done!

question

What are some BGP characteristics

answer

1. Supports VLSM and summarization 2.Send full updates when 2 routers initially become neighbors and send only partial after that 3.Creates and maintains neighbor relationships before exchanging routes, and keepalives are sent to keep this relationship alive

question

BGP is a Path vector protocol what information is exchanged between routers?

answer

Path attributes contained in the updates sent between BGP routers

question

What command shows us the BGP routing table?

answer

sh ip bgp

question

When should BGP be used?

answer

1. If your company is connecting to more than one ISP. 2. If the routing policy is different from the ISP 3. IF your AS has more than one connection to AS's

question

When should BGP not be used

answer

IF your company has a single connection to an ISP or another AS If you don't care what path is used. BGP can be arouter resource HOG Low bandwidth connection between AS's

question

BGP peering process?

answer

BGP uses TCP port: 179 (don't block this!) 1.Once the connection is established The BGP peers exchange routes and synchronize their tables 2. ONce this is complete updates are sent only when there is a topology change

question

eBGP peers don't have to be in the same _______________

answer

Autonomous systems

question

iBGP peers do have to be in the same ______________

answer

Autonomous systems

question

BGP CONFIG: How is iBGP configured?

answer

router bgp 100 Neighbor 10.1.1.2 remote-as 100(same)

question

BGP CONFIG: How is eBGP configured?

answer

router bgp 100 neighbor 10.1.1.2 remote as 200 (different)

question

Configure router 1 and 3 on the 171.12.123.0/24 network as eBGP peers

answer

sh ip bgp R1 router bgp 100 neighbor 172.12.123.3 remote-as 200 R3 router bgp 200 neighbor 172.12.123.0.1 remote-as 100

question

What command shows BGP neighbors?

answer

sh ip bgp neighbor

question

BGP state=ACTIVE means?

answer

Neighbor relationship has initiated on one side but is not Established

question

BGP state=IDLE

answer

Intermediate stat neigborship still not established

question

BGP state=Established

answer

Shows how long the neighborship has been active

question

sh ip bgp neighbor

answer

Detailed information on BGP neighbors

question

In BGP what does remote router 0.0.0.0 mean

answer

No router Id learned on the other side

question

What command should be run to sh the remote as of a BGP router

answer

sh ip bgp neighbor

question

Whats wrong with the syntax in the BGP neighbor command? neighbor 171.16.3.3

answer

It's missing the "remote-as #"

question

ACTIVE routes in BGP means what?

answer

theres been some communication with the remote-as router but you haven't received any response.

question

IDLE in BGP means what?

answer

The speaker is waiting for a start event. establishment of tcp communication

question

IF a BGP neighborship goes into IDLE state and remains there what should you check?

answer

1. The ip address in the neighbor statement 2. Verify there is a neighbor statement for the remote router 3. Make sure your local router has a route to that neighbor(Sh ip route: look for: c for connected route)

question

What are the BGP states?

answer

1.IDLE: Initial state of BGP connection. The speaker is waiting for a start event 2.CONNECT: TCP connection REQ is sent 3.ACTIVE: BGP speaker is continuing to create a relationship with the remote router (local router has sent a BGP OPEN packet to the address of the neighbor statement) 4.OPENSENT: BGP has received an OPEN message from the peer. BGP will determine whether the peer is in the sam AS (iBGP) or different AS(eBGP) 5.OPENCONFIRM: BGP speaker is waiting for a keepalive message. If one is received it moves into ESTABLISHED

question

IF a BGP neighborship goes into ACTIVE state and remains there what should you check?

answer

1. Check the remote routers neighbors statement(be sure the remote router knows how to get the OPENconfirm packet back to the local router)

question

Trouble shooting BGP neighbor ship IDLE-ACTIVE back and forth FLAPPING HOW?

answer

Watch the AS #'s and verify they have been configured correctly on each routers bgp process

question

Sh ip BGP summary: timer under up/down in in BGP means what?

answer

Bgp neighborship established

question

BGP CONFIG: R1 has two peers, one share AS 100 and the other in AS200. (also what happens if you configure the local routers own IP address as a BGP peer address)

answer

configuration R1 conf t router bgp100 neighbor 172.12.123.2 remote-as 100 copy run start (ip routing table has to have the route for this to work) R2 conf t neighbor 172.12.123.1 remote-as 100

question

IN BGP to confirm an Established neighbor you run a sh ip bgp summary and see up/down STATE/PfxRcd never Active

answer

Neighborship not established yet in Active STATE

question

IN BGP to confirm an Established neighbor you run a sh ip bgp summary and see up/down STATE/PfxRcd 00:00:17 0

answer

Neighborship is ESTABLISHED

question

IN BGP where can you see the following output? BGP state = Established up for 00:12

answer

sh ip bgp neighbor

question

Where can we learn if iBGP or eBGP is the link for a neighbor? BGP neighbor is 172.12.123.1 remote AS 100, internal link-iBGP,external link e BGP

answer

sh ip bgp neighbor (neighbor's ip address)

question

What's the best way to provide BGP neighborship redundancy

answer

Configure a loopback address to create the adjacency rather than on the physical interface.

question

Why are loopbacks used in BGP deployments?

answer

physical Interfaces go bad, ports go bad, cables go bad. Loopbacks are logical and wont be affected by these issues

question

OSFP: What command should be run to learn what ABRs and ASBR's the local router knows about?

answer

sh ip ospf border-routers

question

TYPE 1 LSA

answer

Router Link STATES Generated by each router for every area the router has a link in. Flooded to a single area only

question

TYPE 2 LSA

answer

NET LINK STATES sent out only by DR's or designated routers Flooded to a single area only

question

TYPE 3 LSA

answer

SUMMARY NET LINK STATES Generated by ABR's describe Inter-area routes. Summarize the networks from one area to another. Not flooded into a total-stub-area.

question

TYPE 4 LSA

answer

SUMMARY ASB LINK STATES Generated By ABR's describe the path to the ASBR. Not flooded into a total-sub-area

question

TYPE 5 LSA

answer

AS EXTERNAL LINK STATES Generated only by ASBR's. Describe links external to the OSPF domain via ROute redistribution. Flooded to all areas exept stub and total-stub area

question

What LSA types will be removed on R2 once the following config has been implemented? R1 router ospf 1 area 34 stub no-summary R2 router ospf 1 area 34 stub

answer

Type 4's and 5 have been removed

question

Type 6 LSA's

answer

MOSPF generated by routers using multicast extensions to OSPF.

question

Type 7s LSA's

answer

generated only by ASBR's only sent into a NSSA Flooded throughout the NSSA's not allowed to leave until they are converted into a type 5 LSA to exit

question

O IA

answer

This is in an area that the local router doesn't have an interface in

question

DEFAULT metric of Redistributed OSPF routes

answer

20

question

How to redistribute a loopback interface on a router into OSPF?

answer

conf t router ospf 1 redistribute connected subnets

question

O E2

answer

Default routing code for Routes redistributed into ospf metric from the ASBR to the final destination AD/20metric

question

A packet capture indicates that several router solicitation messages were sent from a local host on the Ipv6 segment . What is the expected acknowledgement and its usage?

answer

Routers on the IPv6 segment will respond with an advertisement that provides an external path from the local subnet, as well as certain data such as prefix discovery

question

Configures the percentage of bandwidth that may be used by EIGRP on an interface.

answer

Router(config-if)# ip bandwidth-percent eigrp percent

question

A network engineer is trying to implement broadcast-based NTP in a network and executes the ntp broadcast client command. Assuming that an NTP server is already setup, what is the result of the command?

answer

It enable receiving NTP broad casts on the interface where the command was executed

question

A network engineer is configuring SNMP on network devices to utilize one-way SNMP notifications. However, the engineer is not concerned with authentication or encryption. Which command satisfies the requirements of this scenario?

answer

router (config)#snmp-server host 172.16.201.28 traps 2 c CISCORO

question

Which tow functions are completely independent when implementing NAT 64 over NAT-PT?

answer

DNS, NAT

question

After Dual calculations, a router has identified a successor route but no routes have qualified as a feasible. successor. IN the event that the current successor goes down, what process will EIGRP use in the selection of a newo successor?

answer

The route will transition into the active state

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