计算机网络原理智慧树知到期末考试答案章节答案2024年天津理工大学

计算机网络原理智慧树知到期末考试答案+章节答案2024年天津理工大学FTP,SNMP,HTTPandInternettelephoneallusetheTCPprotocol.

答案:错WhatarethefollowingoptionsforTCPpipelining?

答案:singleretransmissiontimer###cumulativeacksCommontopologystructureofLANinclude()

答案:starstructure###busstructureTCPsendingrateisapproximatelyequaltocwnd/RTT.

答案:对WhichofthefollowingapplicationsuseUDP?

答案:SNMP###DNSWhichofthefollowingoptionsarerightinP2Parchitetures?

答案:peerscommunicatedirectlywitheachother###mayhavedynamicIPaddresses###selfscalabilityWhatinformationisusedbythehosttosendthesegmenttoappropriatesocket？

答案:portnumber###IPaddressHowtoconnectendsystemstoedgerouter?

答案:residentialaccessnetworks###institutionalaccessnetworks###mobileaccessnetworksThelengthofIPV6addressis（）bits.

答案:128Reliabledatatransferprotocoloverachannelwithbiterrorsandpacketlossesisrdt2.1.

答案:错EthernetspecifiesthatitsMTUvalueis1500bytes.

答案:对Providedα=0.125,currentvalueofEstimated-RTTis0.4s,Sample-RTTis0.8s,thenthenewvalueofEstimated-RTTis0.75s.

答案:错Wide-areawirelessaccess'stransmissionrateisbetween1and10Mbps.

答案:对EndsystemsconnecttoInternetviaaccessISPs(InternetServiceProviders).

答案:对CRCcanachieve100%errordetetion.

答案:错WhichofthefollowingoptionsdoesTCPinclude?

答案:connectionsetup###congestioncontrol###flowcontrolDHCPcontainswhichofthefollowingoptions?

答案:DHCPrequest###DHCPoffer###DHCPdiscover###DHCPackWhatarethetypesofrouterswitchingfabrics?

答案:memory###bus###crossbarWhichofthefollowingoptionsbelongtotheservicesprovidedbytheapplicationlayer?

答案:VoIP###e-commerce###WebWhataremajorcomponentsinemail?

答案:mailservers###useragents###SMTPIn()modeofoperation,eachwirelesshostisconnectedtothelargernetworkviaabasestation(accesspoint).

答案:infrastructureAs

an

IP

datagram

travels

from

its

source

to

its

destination:

答案:the

router

uses

the

destination

IP

address

to

consult

its

routing

tableHowmanytypesofresourcerecordsarethereinDNS?

答案:4Therearetwotypesofnodesin3Gcorenetwork:().

答案:SGSN###GGSNInthefollowingoptions,whichoneisnotaguidedmedia?

答案:satellite()makessurethatneithersideofaconnectionoverwhelmstheothersidebysendingtoomanypacketstoofast.

答案:FlowcontrolTheInternet’sconnection-orientedservicehasaname,itis().

答案:TCPTheprotocolsofvariouslayersarecalled().

答案:theprotocolstackThehostcomponentofaCIDRaddressoftheforma.b.c.d/22cancontainaddressesfor:

答案:2(32-22)hostsminus“special”hostsWhichkindofmediaisnotaguidedmedia?

答案:digitalsatellitechannelThelinklayerprovidessupportforstore-and-forwardatthenetworklayer

答案:对Virtualcircuitsprovideconnection-orientedservices.

答案:对Go-back-Nprotocolisstop-and-waitprotocol.

答案:错WhichofthefollowingarefeaturesoftheInternetservicesmodel?

答案:notimingguarantees###nobandwidthguarantees802.3isatypicalEthernetstandard,In802.3standardcollections,whichstandardsuseFibermedium?

答案:100BASE-SX###100BASE-BX###100BASE-FXWhatispossiblearchitecturesintheapplicationlayer?

答案:P2P###client-serverEndsystems,packetswitches,andotherpiecesoftheInternet,run()thatcontrolthesendingandreceivingofinformationwithintheInternet.

答案:protocolsIntheInternet,theequivalentconcepttoendsystemsis().

答案:hostsWhichofthefollowingoptionsbelongtotheendsystem？

答案:smartphone###server###PCWhichofthefollowingarekeynetwork-layerfunctions？

答案:forwarding###routingWhichofthefollowingoptionbelongstothecircuit-switchednetworks?

答案:bothAandBWhenadestinationhosttransportlayerreceivesdatafromthenetworklayer,itunambiguouslyidentifiestheappropriateprocesstopassthedatatobyusingatripletconsistingof:

答案:Destinationport,sourceport,sourceIPaddressdatasendedis1101011011,useCRCcheck,generator(G)is10011,thenfinaldatasendis()

答案:11010110111110SupposetheIEEE802.11RTSandCTSframeswereaslongasthestandardDATAandACKframes.TherewouldbenoadvantagetousingtheCTSandRTSframes.

答案:对Therearetwofundamentalapproachestobuildinganetworkcore,circuitswitchingandpacketswitching.

答案:对Whenthenetworkisheavilyloaded,theCSMAprotocolismoreefficientthantheTDMAprotocol.

答案:错UDPsocketidentifiedbydestinationIPaddressanddestinationportnumbers.

答案:对TheCSMA/CDmechanismenablestheuseofsharedmedia-basedwirelessLANS

答案:错Atransport-layerprotocolprovidesforlogicalcommunicationbetweenApplicationprocesses

答案:对PackettransmissiondelaymeansthetimerequiredtotransmitL-1(bit)packetintolink.

答案:错Whatisthebasicideaofapurealoha?

答案:randomresendofconflict###accesschannelsondemandEthernetaddressesarealsocalledMACaddresses.

答案:对WhichofthefollowingbelongtotheInternetprotocolstack?

答案:linklayer###transportlayerTheroleofaswitchinaVLANis()

答案:exchangeVLANmemberinformation###dataframesareexchangedwithinaVLAN###implementVLANpartitionTherearefouraddressfieldsin802.11frame.

答案:对Whichofthefollowingprotocolsbelongtothenetworklayerprotocols?

答案:ICMP###OSPF###IPTheDNSprotocolrunsover____andusesport____.

答案:UDP53HTTPresponsestatuscodeforBadRequestis().

答案:400WhatprotocolsareincludedintheInternettransportlayer?

答案:TCP###UDPTheprimaryfunctionoftheaddressresolutionprotocol(ARP)thatresidesinInternethostsandroutersis:

答案:TotranslatebetweenIPaddressesandLANaddresseswhichofthefollowingarethebasicfeaturesofparity?

答案:onlycheckforoddbiterrorsThe()isaworldwidecomputernetwork,thatis,anetworkthatinterconnectsmillionsofcomputingdevicesthroughouttheworld.

答案:publicInternetWhichisalegalemailaddress?

答案:book@263.netInthefollowingoptions,whichdoesnotbelongtothenetworkedge?

答案:routersLarger()makesiteasierforthereceivertoextractthetransmittedsignalfromthebackgroundnoise.

答案:SNRTheTransmissionControlProtocol(TCP)provideswhichofthefollowingservices?

答案:ApplicationmultiplexingThehostthatinitiatesthesessionintheInternetislabeledas____.

答案:clientIntheOSImodel,thetransportlayercanimplementrouting,congestioncontrolandinterconnectionfunctions.

答案:错Beforean802.11stationtransmitsadataframe,itmustfirstsendanRTSframeandrecerveacorrespondingCTSframe.

答案:错Biterrorrate(BER)referstotherelativemeasurementofreceivedsignalandnoiseintensity.BERisusuallymeasuredindecibels(DB).

答案:错Token-ringnetworkhasconflicts.

答案:错IntheRIPprotocol,ahopcountgreaterthan15isconsideredunreachable.

答案:对TheSYNsegmentisusedforTCPconnectionsetup.

答案:对TheInternet’snetworklayerisresponsibleformovingnetwork-layerpacketsknownasframefromonehosttoanother.

答案:错UDPserviceprovidesReliabledatatransfer,Flowcontrol,Delayguarantee,Congestioncontrol.

答案:错Switcheswith1010Mbit/sportscanhaveatotalbandwidthofupto100Mbit/s.

答案:对Ifweneedtotransfer6Mbitsat2Mbps,thenone-hoptransmissiondelaywillbe6s.

答案:错Ehernetand802.11usethesameframestructure

答案:错Whatmightspywaremalwaredo?

答案:recordkeystrokes###uploadinfotocollectionsite###recordwebsitesvisited###stealinformationAsamobilenodegetsfartherandfartherawayfromabasestation,whataretwoactionsthatabasestationcouldtaketoensurethatthelossprobabilityofatransmittedframedoesnotincrease?()

答案:Reducingthetransmissionrate###IncreasingthetransmissionpowerWhichofthefollowingroutingprotocolsareintra-ASroutingprotocols?

答案:RIP###IGRP###BGPWhatarethepacketdelays?

答案:nodalprocessingdelay###transmissiondelay###propagationdelay###queueingdelayWhatconditionstriggeraTCPretransmission?

答案:timeoutevents###tripleduplicateacksThedownstreamtransmissionrateofHFCisupto30Mbps,andtheupstreamtransmissionrateisthesame.

答案:错Whatarethetypeofwirelessnetworks?()

答案:Multi-hop,infrastructure-based###Multi-hop,infrastructure-less###Singlehop,infrastructure-based###Singlehop,infrastructure-lessWhichdoesTCPserviceprovides?

答案:flowcontrol###reliabletransport###congestioncontrol###connection-orientedThehostcomponentofaCIDRaddressoftheforma.b.c.d/23cancontainaddressesfor512hosts.

答案:错ThelengthofanEthernetaddressis

答案:6bytesWhattableitemsdoestheARPtablecontain?

答案:IPaddress###MACaddress###TTLICMPis_____.

答案:theprotocolofnetworklayerWhichofthefollowingoptionsbelongtosomeofservicesthelinkLayercanprovide？

答案:errordetectionandcorrection###linkaccess###framing###flowcontrolWhatlayersdoestheroutercontain?

答案:linklayer###networklayer###physicallayerWhichareP2Papplications?

答案:StreamingMedia###Distributeddatabase###filedistribution###VoIPWhatdoesFTPreturncode425mean?

答案:Can’topendataconnectionWhichofthefollowingoptionsareapplicationlayerprotocols？

答案:POP###HTTP###SMTPThefollowingmediaaccesscontrolmethods,donotconflictare().

答案:CDMA###FDMA###TDMAWhichdoesUDPserviceprovides?

答案:datatransferTCPprovidesa____servicetoitsapplicationstoeliminatethepossibilityofthesenderover-flowingthereceiver’sbuffer.

答案:flow-controlWhichenvironmentistoken-ringbettersuitedtothanCSMA/CDnetworks?

答案:heavyloadWhichdoesnotbelongtotheDNShierarchy?

答案:LocalDNSnameserverBasedonwhatdoEthernetswitchesforwardframes?

答案:MACaddressInSMTP,themesseageformatmustbe().

答案:7-bitASCIWhichapplication’sNOTusingTCP?

答案:DNSFromthelistbelow,selecttheitemsfoundintheTCPsegmentstructurethatarenotfoundintheUDPsegmentstructure:

答案:SequenceWhichofthefollowingsarenotElementsofawirelessnetwork?()

答案:routerWhichisanapplicationlayerprotocol?()

答案:DNSCDMAisakindof()protocol

答案:randomaccessAPstransmitbeaconframes.AnAP’sbeaconframeswillbetransmittedoveroneofthe()channels.ThebeaconframespermitnearbywirelessstationstodiscoverandidentifytheAP.

答案:11Whatarethetypeofwirelessnetworks?

答案:Multi-hop,infrastructure-less###Singlehop,infrastructure-based###Singlehop,infrastructure-less###Multi-hop,infrastructure-basedHostsinwirelessnetworkscanworkintwomodes()

答案:infrastructuremode###adhocmodeTherearetwoaddressfieldsin802.11frame.

答案:错MACaddressisuniqueintheworld.

答案:对Whichlayerdoestheswitchworkon?

答案:linklayerWhatistrueoftheARPtableinthefollowingdescriptionis?

答案:mappingofIPaddresstoMACaddressTheswitchreceivesaframewhosetargeaddresscannotbefoundinitsMACaddresstable,thenswitchwilldo()

答案:floodingA16-portswitch,eachportis10/100Mfull-duplexadaptive,thenbusbandwidthoftheswitchis()

答案:100MAnIPaddressconsistsofanetworknumberfieldandahostnumberfield.

答案:对ThePINGcommandisimplementedbytheICMPechorequest/reply.

答案:对TheInternet’snetworklayerisresponsibleformovingnetwork-layerpacketsknownas()f