网络工程计算机网络原理参考复习题四有答案.docx
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网络工程计算机网络原理参考复习题四有答案
1WhichLayer1devicescanbeusedtoenlargetheareacoveredbyasingleLAN
segment?
(Selecttwo)DE
A.Switch
B.Router
C.NIC
D.hub
E.Repeater
F.RJ-45transceiver1.
2AnISDNlinkcanbeencapsulatedusingeitherPPPorHDLC.Whatarethe
advantagesofusingPPP?
(Selecttwoanswerchoices)BD
A.PPPiseasiertoconfigureandmaintainthanHDLC.
B.PPPisconsistentlyimplementedamongdifferentequipmentvendors.
C.PPPwillrunfasterandmoreefficientlythanHDLConcircuit-switchedISDNlinks.
D.PPPauthenticationwillpreventunauthorizedcallersfromestablishinganISDNcircuit.
E.PPPcanberoutedacrosspublicfacilities,whileHDLCisnotroutablein
circuit-switchednetworks.
F.PPPsupportsasynchronouscommunication.
3Whichofthefollowingprotocolsoperateatthe'Applicationlayer'oftheOSImodel?
(Selectallvalidanswers)BC
A.TCP
B.Telnet
C.FTP
D.ARP
E.IP
F.Noneoftheabove
4Whichthreeoftheprotocolsbelowbelongtotheapplicationlayer?
(Selectthreeanswerchoices)BCE
A.ARP
B.HTTPS
C.SMTP
D.CDP
E.TFTP
F.ICMP
5InwhichSpanning-TreestatesdoesaswitchportlearnMACaddresses?
(Select
two)CD
A.Blocking
B.Listening
C.Forwarding
D.Learning
E.Relaying
6WhichOSIlayerisassociatedwiththefollowing:
Theacknowledgementoftransmissions,sequencing,andflowcontrolacrossanetwork?
(chooseone)C
A.Layer2
B.Layer3
C.Layer4
D.Layer5
E.Layer6
F.Layer7
7Refertothegraphic.Two2950switchesconnectthroughportsFa0/24anda
straight-throughcable.Basedontheoutputoftheshowcdpneighborcommand
frombothswitchesandtheinformationgiven,whatcanbeconcluded?
A.PortFa/24oneachswitchmustbeconfiguredinVLAN1inorderfortheswitchesto
seeneighborinformation.
B.PortFa0/24oneachswitchmustbeconfiguredasatrunkportinorderforneighbor
informationtobereceived.
C.Theswitchesarenotcabledproperly.
D.AnIPaddressneedstobeassignedtobothswitches.
E.VTPisincorrectlyconfiguredonswitchTK1.
8Whichoftheprotocolsbelow,operatesatLayer2oftheOSImodel,andisusedtomaintainaloop-freenetwork?
(chooseone)B
A.RIP
B.STP
C.IGRP
D.CDP
E.VTP
9YouhavesetupanInternetbasedFTPserver,wherepeoplecanuploadanddownloadfiles.IntermsoftheOSImodel,whatisthehighestlayerusedduringtheFTPsessions.A
A.Application
B.Presentation
C.Session
D.Transport
E.Internet
F.DataLink
G.Physical
10FourTestKingswitchesareconnectedtogetherasshowninthediagrambelow:
StudytheExhibitcarefully.WhatisthepurposeoftheSpanningTreeProtocolthat
isoperatingintheexhibitedswitchtopology?
B
A.Toelectaparticularswitchasbackupdesignatedswitch.
B.TohaveoneactiveLayer2paththroughtheswitchesnetwork.
C.Toselectthebestpathtoaremotedestinationthatisonadifferentnetwork.
D.TolearntheMACaddressesofhostattachedtotheswitchesnetwork.
E.TodistributeVLANconfigurationinformationthroughouttheswitchednetwork.
11WhichOSIlayerheadercontainstheaddressofadestinationhostthatisanothernetwork?
E
A.application
B.presentation
C.session
D.transport
E.network
F.datalink
G.physical
12Inthecommunicationsindustry,whatarethefeaturesandbenefitsofusingthelayeredOSImodel?
(Selectthetwobestanswers)AD
A.Itencouragesindustrystandardizationbydefiningwhatfunctionsoccurateachlayerofthemodel.
B.Itnecessitateschangesinfunctionalityinonelayertootherlayers.
C.Itenablesequipmentefficiencyfromdifferentvendorstousethesameelectroniccomponents.
D.Itdividesthenetworkcommunicationprocessintosmallerandsimplercomponents,thusaidingcomponentdevelopment,design,andtroubleshooting.
E.Itsupportstheevolutionofmultiplecompetingstandards,andthusenhancesbusinessequipmentmanufacturingopportunities.
13Whichofthestatementsbelowaretrueregardingtheavailabilityofbandwidthonanetwork?
(Selectallthatapply.)CD
A.Bandwidthavailabilityisdecreasing.
B.Bandwidthavailabilityisinfinite.
C.Bandwidthisusedwhenanalyzingnetworkperformance.
D.Bandwidthavailabilityisfinite.
E.Bandwidthavailabilityisfixed.
14Whichoneofthefollowingisthemostcommonlyusedlayer2networkdevice?
C
A.Hub
B.Bridge
C.Switch
D.Router
E.Repeaters
F.Noneoftheabove
15.ACorporationoffice'snetworktopologyisshowninthediagrambelow:
16HostPC1needstocommunicationswiththee-mailservershownabove.
WhataddresswillbeplacedonthedestinationaddressfieldoftheframewhenitleaveshostPC1?
A.TheMACaddressofPC1
B.TheMACaddressofswitchSwitch1
C.TheMACaddressofthefa0/0interfaceoftherouter.
D.TheMACaddressoftheEth1/0interfaceoftherouter.
E.TheMACaddressofswitchTestKing2
F.TheMACaddressoftheemailserver
17.WhichofthefollowinglayersoftheTCP/IPmodelmostcloselycorrespondstothenetworklayeroftheOSImodel?
B
A.Application
B.Internet
C.Transport
D.Network
E.DataLink
18YouhaveanEthernetnetwork.Whichoftheconditionsbelowcanleadtoincreased
congestiononyournetwork?
(Selecttwoanswerchoices)DF
A.TheuseofFull-DuplexMode.
B.TheCreationonNewCollisionDomains.
C.TheCreationonNewBroadcastDomains.
D.TheAdditionofHubstotheNetwork.
E.TheuseofswitchesintheNetwork.
F.TheAmountofARPorIPXSAPTraffic.
19Whatisthepurposeofthespanning-treealgorithminaswitchedLAN?
C
A.Toprovideamonitoringmechanismfornetworksinswitchedenvironments.
B.TomanageVLANsacrossmultipleswitches.
C.Topreventswitchingloopsinnetworkswithredundantswitchedpaths.
D.Tosegmentanetworkintomultiplecollisiondomains.
E.Topreventroutingloopsinnetworks.
20ACorporationLANisdisplayedinthediagrambelow:
21HostBsendsaframetohostC.Whatwilltheswitchdowiththeframe?
A.Droptheframe
B.Sendtheframeoutallportsexceptport0/9
C.ReturntheframetohostB
D.SendanARPrequestforhostC
E.SendanICMPHostUnreachablemessagetoHostB
F.RecordthedestinationMACaddressintheswitchingtableandsendtheframedirectlytoHostC
22.TheCorporationLANconsistsof6switchesconnectedtogetherasshowninthediagrambelow:
23Whatisthenameofthepotentialproblemofthisswitchsetup,andwhatprotocol
canpreventsitsoccurrence.(Selectonlyoneanswerchoice)F
A.routingloops,holddowntimers
B.switchingloops,splithorizon
C.routingloops,splithorizon
D.switchingloops,VTP
E.routingloops,STP
F.switchingloops,STP
24YouhavebeencontractedbyTestKingtoreplacethenetworkcablingoftheir
LAN's.TheSystemAdministratorgivesyouspecificinstructionsthatheneedsto
usecablingintheLANthatisNOTsusceptibletoEMI.
Whatkindofcablewouldyouusetosatisfytheadministrator'sneeds?
E
A.Thicknetcoaxialcable.
B.Thinnetcoaxialcable.
C.Category5UTPcable.
D.Category5STPcable.
E.Fiberopticcable.
F.Alloftheabove
25.WhichtwoofthefollowingvaluesdoesSTPtakeintoconsiderationwhenitelectstherootbridge?
(Selecttwoanswerchoices)CE
A.TheBPDUversionnumber
B.Theaccesslayerbridgesetting
C.TheBridgeID
D.Thespanning-treeupdatenumber
E.Thebridgepriority
F.TheVLANnumber
26.WhichoneofthefollowingactionswouldactuallyincreasecongestiononanEthernetnetwork?
C
A.Increasingthenumberofcollisiondomains.
B.Micro-segmentingthenetwork.
C.Addinghubsforconnectivitytothenetwork.
D.Puttingadditionalswitchesinthenetwork.
E.ImplementingVLANsinthenetwork.
27WhatistheIEEEstandardassociatedwithGigabitEthernet?
(Selecttwoanswer
choices)CE
A.802.11
B.802.5
C.802.3ab
D.802.3ae
E.802.3z
F.802.3u
28.InaswitchedLANnetwork,whatistheSpanning-Treealgorithmusedfor?
C
A.Itisusedtoprovideamechanismforroutingupdatesinswitchedenvironments.
B.Itisusedtopreventroutingloopsinnetworkswithredundantroutes.
C.Itisusedtopreventswitchingloopsinnetworkswithredundantswitchedroutes.
D.Itisusedtomanage,theaddition,deletion,andnamingofVLANsacrossmultipleswitches.
E.Itisusedtosegmentanetworkintomultiplecollisiondomains.
F.Noneoftheabove.
G.AlloftheabovearefunctionsofSTP.
29.Onahalf-duplexEthernetLAN,twohostsattempttosenddatasimultaneously,resultinginacollision.Followingthiscollision,whatwillthehostsdo?
(Selectallvalidanswers)C
A.Thedestinationhostsendsarequesttothesourceforretransmission.
B.Thehostswillattempttoresumetransmissionafteratimedelayhasexpired.
C.Thehostswilldonothing,asthehigherlayersareresponsiblefordataerrorcorrectionandre-transmission.
30.Whyisfull-duplexEthernetsuperiortoitssingle-duplexcounterpart?
(Selecttwoanswerchoices.)BD
A.Itusesinexpensivehubs
B.Itoperateswithoutcollisions
C.Itoperatesonswitches
D.Itprovidesfasterdatatransfer
E.Itutilizesfewerwiringpairs
31Whichofthefollowingstatementscorrectlydescribethedifferencesbetween
half-duplexandfull-duplexEthernet?
(Selecttwoanswerchoices.)BD
A.Full-duplexEthernetusesCSMA/CDtopreventcollisions.
B.Half-duplexEthernetusesaloopbackcircuittodetectcollisions.
C.Afull-duplexEthernetcardallows20Mbpsfordatatransmission.
D.Full-duplexEthernetmakesuseoftwopairsofwiresfordata.
E.AnEthernethubcanoperatebothhalfandfullduplexsimultaneously.
32.Whichofthefollowingstatementscorrectlydescribethedifferencesbetweenhalf-duplexandfull-duplexEthernet?
(Selecttwoanswerchoices