Network Exam Chapter 9 – Flashcards
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Identify the quality of service (QoS) mechanism that can fragment large packets and interleave smaller packets in amongst the packet fragments.
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LFI
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What is an acceptable one-way latency in a typical VoIP network?
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150 ms Network performance requirements for voice include no more than 150 ms of one-way delay, no more than 30 ms of jitter, and no more than 1 percent packet loss
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Identify the quality of service (QoS) function that alters bits in a frame, cell, or packet.
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Marking
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Identify the congestion-avoidance mechanism from the following list of QoS tools.
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RED
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What type of delay is the amount of time required for a packet to exit a router's serial interface?
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Serialization delay
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You are designing a small office/home office (SOHO) network, and you wish to have four subnets, while maximizing the number of hosts per subnet. The network you need to subnet is 192.168.5.0/24. Which of the following is one of the four subnets you should create?
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192.168.5.64/26 Four subnets are supported with two borrowed bits, based on the formula: number of subnets = 2̂s, where s is the number of borrowed bits (that is, 2̂2 = 4). Since a design requirement stated that the number of hosts per subnet be maximized, you would not want to use more borrowed bits than necessary. Therefore, you should choose a 26-bit subnet mask (that is, 255.255.255.192). The block size is 64 (that is, 256 - 192 = 64). Therefore, the subnets created by subnetting the 192.168.5.0/24 network with a 26-bit subnet mask are: 192.168.5.0/26 192.168.5.64/26 192.168.5.128/26 192.168.5.192/26
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What technology permits the bundling of links together to increase bandwidth and redundancy?
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LACP
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What performance optimization technology uses a network appliance, which can receive a copy of content stored elsewhere (for example, a video presentation located on a server at a corporate headquarters), and serves that content to local clients, thus reducing the bandwidth burden on an IP WAN?
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Content Engine
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Identify the quality of service (QoS) mechanism that can set a bandwidth limit on traffic and drop packets attempting to exceed that bandwidth limit.
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Policing
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If you want to buffer excess traffic and send it later, what traffic conditioning technology should you consider?
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Traffic Shaping
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Identify the quality of service (QoS) mechanism that can set a bandwidth limit on traffic and delays packets, rather than drops packets, attempting to exceed that bandwidth limit.
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Traffic Shaping
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Which of the following protocols is most latency sensitive?
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RTP (Real-time Transport Protocol)
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Queuing is another name for which of the following quality of service (QoS) functions?
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Congestion Management
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What mode of NIC redundancy uses has only one NIC active at a time?
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Active-standby
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A lack of bandwidth can lead to which QoS issues?
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Packet Drops Delay Jitter
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What term refers to the weakening of a signal as it travels in the network?
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Attenuation
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Which traffic-shaping parameter is a measure of the number of bits or bytes transmitted during a timing interval?
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Bc
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Which of the following is an open standard variant of HSRP?
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CARP Hot Standby Router Protocol (HSRP) is a Cisco-proprietary approach to first-hop (that is, Layer 3) redundancy. Common Address Redundancy Protocol (CARP) is an open standard variant of HSRP. Differentiated Services Code Point (DSCP) is a Layer 3 Quality of Service (QoS) marking. Link Fragmentation and Interleaving (LFI) is a QoS link efficiency mechanism. RTP Header Compression (cRTP) is a QoS link efficiency mechanism.
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If a network has "five nines" of availability, what is its maximum downtime per year?
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Approximately five minutes A network that has "five nines" of availability is up and operational 99.999 percent of the time. This equates to a maximum yearly downtime of approximately five minutes. A network that has "six nines" of availability is up and operational 99.9999 percent of the time. This equates to a maximum yearly downtime of approximately 30 seconds. A network that has "four nines" of availability is up and operational 99.99 percent of the time. This equates to a maximum yearly downtime of approximately 50 minutes. A network that has "three nines" of availability is up and operational 99.9 percent of the time. This equates to a maximum yearly downtime of approximately nine hours
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Which of the following mechanisms is considered a link-efficiency tool in QoS?
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LFI CBWFQ is congestion management, WRED is congestion avoidance, and traffic shaping is considered policing and shaping.
