Networking Quiz4
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You have decided to establish a VoIP system in your home. Which of the following devices is necessary to connect your analog telephone to your VoIP server?
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ATA
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Skype, the popular Internet telephony service provides a user with what type of interface?
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Softphone
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A company's use of VoIP on its WAN to avoid long-distance telephone charges is known as:
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Toll bypass
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Which of the following is the most popular signaling protocol used on traditional, circuit-switched PSTN connections?
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SS7
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Watching a YouTube video on the web is an example of the following types of video-over IP services
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Streaming video
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In an IPTV system, which of the following functions does a set-top box perform?
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Decodes video signals and issues them to a television
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what type of video over IP service relies on full duplex communication?
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videoconferencing
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what protocol manages addressing for multicast groups?
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IGMP
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which of the following protocols would be used by a video bridge to invite a video phone o join a videoconference
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H.225
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you are using a softphone to initiate a videa call with a friend in another state. WHich of the following protocols is generating segments at the Transport Layer of this transmission?
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UDP
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what function does the H.225 protocol provide, as part of the H.323 VoIP specifications?
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handles call setup, call routing, and call termination
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in SIP, which of the following network elements maintains a database with network address information for every SIP client?
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registrar server
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which of the following are reasons for choosing SIP over H.323?
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SIP messages use fewer processing resources
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which of the following devices enable multiple media gateways to communicate
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MGC
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at what layer of the OSI model does RTP operate
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Application
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what can RTCP do that RTP cannot
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report on the degree of packet loss and delay in connection
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how does RSVP help improve QoS
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it establishes a path btw the sender and the receiver
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the traffic class field in an IPv6 datagram serves the same function as which of the following fields in an IPv4 datagram
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DiffServ
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on a VoIP network that uses the DiffServ QoS technique, which of the following makes certain that a router forwards packets within a given time period
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expedited forwarding
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in the DiffServ QoS technique a forwarding specification that allows routers to assign data streams one of several prioritization
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assured forwarding (AS)
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an internal or externally attached adapter that converts analog telephone signals into packet-switched voice signals and vice versa
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analog telephone adapter(ATA)
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technique ensuring QoS by prioritizing traffic
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differentiated service (DiffServ)
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any client, server, or gateway communicating on the network
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endpoint
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an ITU standard that describes an architecture and a suite of protocols for establishing and managing multimedia services sessions on a packet switched network
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H.323
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the provision of telephone service over the internet
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internet telephony
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a computer that provides support for multiple H.323 terminals and manages communication btw them
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multipoint control unit (MCU)
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gateway capable of accepting connections from multiple devices and translating analog signals into packetized, digital signals, and vice versa
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media gateway
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protocol used btw media gateway controllers and media gateways
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MEGACO
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a telephone switch used to connect and manage an organizations voice calls
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private branch exchange (PBX)
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a server that accepts requests for location info from user agents, then queries he nearest registrar server on behalf of those user agens
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redirect server
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a QoS technique that attempts to reserve a specific amount of network resources for a transmission before the transmission occurs
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Resource reservation protocol (RSVP)
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a device that decodes digital video signals and issues them to the television
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set top box
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an application layer signaling and control protocol for multiservice
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session initiation protocol (SIP)
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a computer configured o act like an IP telephone
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softphone
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set of standards established by the ITU for handling call signaling on the PSTN
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signaling system 7 (SS7)
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a cost-saving benefit that results from organizations completing long distance telephone calls over their packet switched networks
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toll bypass
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the provision of telephone service over a packet-switched network running he TCP/IP protocol suite
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Voice over IP (VoIP)
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a tool for accessing and testing a telephone company's local loop
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butt set
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a troubleshooting tool that tests cables for continuity, but can also measure cross talk, attenuation and impedance
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cable performance tester
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a device that tests cables for continuity, segment length, distance to a fault, attenuation along cables
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cable tester
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a software program used to document technical problems and how they were resolved
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call tracking system
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a process of program that provides support personnel with a centralized means of documenting changes made to the network
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change management system
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an instrument that tests whether voltage issued at one end of a cable can be detected at the opposite end of the cable
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continuity tester
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a frame that is not actually a data frame, but rather an aberration caused by a device misinterpreting stray voltage on the wire
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ghost
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a device that handles electrical signals improperly, usually affecting the rest of the network
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jabber
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collision that takes place outside the normal window in which collisions are detected
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late collision
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collision that occurs when two or more stations are transmitting simultaneously
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local collision
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instrument that can measure multiple characteristics of an electric circuit, including resistance and voltage
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multimeter
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the result of the CRC generated by the originating node not matching the checksum calculated from the data received
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negative frame sequence check
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software-based tool that monitors traffic on the network from a server or workstation attached to the network
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network monitor
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a device used to measure resistance in an electrical circuit
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ohmmeter
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a performance testing device for use with fiber-optic networks
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optical time domain reflector (OTDR)
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the feature of a network adapter that allows it to pick up all frames that pass over the network
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promiscuous mode
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a software package or hardware-based tool that can capture an analyze data on a network
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protocol analyzer
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a tool that assesses the characteristics of wireless signals
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spectrum analyzer
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a high end instrument for testing the qualities of a cable
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time domain reflector
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a small electronic device that issues a signal on a wire pair
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tone generator
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a small electronic device that emits a one when it detects electrical activity on a wire pair
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tone locator
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any condition in which voltage exceeds or drops below predefined levels
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voltage event
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a device used to measure voltage on an electrical circuit
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voltmeter
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a plan for when and how often backups occur and which backups are full, incremental or differential
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backup rotation scheme
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a virus that resides on the boot sector of an external storage device and is transferred to the partition sector or the DOS boot sector on a hard disk when the machine starts
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boot sector virus
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a program that runs automatically
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bot
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a protocol that allows a pool of computers or interfaces to share on or more IP addresses
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common address redundancy protocol (CARP)
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a fault-tolerance technique that links multiple servers to act as a single server
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clustering
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a place where the computers, devices, and connectivity necessary to rebuild a network exist, but they are not appropriately configured, updated or connected to match the network's current state
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cold site
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a duplicate component that is not installed, but can be installed in case of failure
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cold spare
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a backup method in which only data that has changed since the last full or incremental backup is copied to a storage medium, and in which that same info is marked for subsequent backup regardless of whether it has changed or not.
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differential backup
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a virus that is encrypted to prevent detection
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encrypted virus
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the capability for one component to assume another components responsibilities without manual intervention
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failover
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the malfunction of one component of a system
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fault
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the capacity for a system to continue performing despite an unexpected hardware or software malfunction
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fault tolerance
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a distinct network transmission method that relies on fibre-optic media an its own proprietary protocol
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Fibre Channel
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a virus that attaches itself to executable files
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file infector virus
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a method of implementing RAID that relies on an externally attached set of disks and a RAID disk controller, which manages the RAID array
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hardware RAID
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a type of virus scanning that attempts to identify viruses by discovering virus like behavior
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heuristic scanning
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a place where the computers, devices and connectivity necessary to rebuild a network exist and all are appropriately configured, updated and connected to match your network's current state
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hot site
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a disk or partition that is part of the array, but used only in case one of the RAID disks fails
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hot spare
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a protocol that enables users running special IRC client software to communicate instantly with other participants in a chat room
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internet relay chat (IRC)
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a fault-tolerance technique in which multiple ports or interfaces are bonded and wok in tandem to create one logical interface
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link aggregation
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a program designed to start when certain conditions are met
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logic bomb
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a virus that takes the form of an application
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macro virus
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a program or piece of code designed to harm a system or its resources
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malware
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an authoritative name server that is queried first on a network when resolution of a name that is not already cached is equested
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master name server
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a fault-tolerance technique in which one component or device duplicates the activity of another
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mirroring
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a technique in which data is backed up to a central location over the internet
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online backup
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a power supply that uses the A/C power from the wall outlet to continuously charge its battery
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online UPS
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a type of media capable of storing digitized data,
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optical media
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virus that changes its characteristics every time i is transferred to a new system
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polymorphic virus
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a server redundancy measure that uses shared, multiple physical or logical hard disks to endue data integrity and availablility
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RAID (redundant array of independent disks)
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a distinct network of multiple storage devices and servers that provides fast, highly available and highly fault-tolerant access to large quantities of data for a client/server network
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storage area network
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the comparison of a files content with known virus signatures
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signature scanning
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a name server that can take the place of a master name server to resolve names and addresses on a network
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slave name server
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a measure of electrical power
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volt-amp (VA)
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a place where the computers, devices and connectivity necessary to rebuild a network exis
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warm site
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an unwanted program that travels bw computers and across neworks
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worm
