SSD8单选题.docx
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SSD8单选题.docx
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SSD8单选题
1.1.1
1.InabroadcastnetworkCorrectansweris(d)
(a)onlythecomputersthataretunedtoachannelseeandprocessthepacketsinthatchannel
(b)allcomputersseeandprocesstheapplicationdatawithinallpackets
(c)onlythedestinationcomputerseesapacket
(d)allcomputersseeallpackets,buttheapplicationdataineachpacketisonlyprocessedbythedestinationcomputer
2.TheMaximumTransferUnit(MTU)isaparameterofCorrectansweris(d)
(a)thesizeofdatasentbytheapplication
(b)theapplicationprotocol
(c)theoperatingsystem
(d)thetechnologyofthephysicalnetwork
3.WhenyouconnectyourcomputertotheInternet,theprotocol(s)yourcomputerusesis(are)selectedaccordingto(a)
(a)theapplicationclientandserveryouuseateachmoment
(b)whichHTTP(Web)serveryouconnectto
(c)whichoperatingsystemisrunningonyourcomputer
(d)whatvendoryourInternetserviceproviderpurchasedequipmentfrom
4.Whichofthefollowingmethodsareinvokedbyaclientimplementedwithsockets?
(d)
Iconnect()IIlisten()IIIread()
(a)IIIonly
(b)I,II,andIII
(c)Ionly
(d)IandIIIonly
5.Anadvantageofdefiningnetworkprotocolsthroughagreementamongmanycompaniesandindividualsisthat(c)
(a)onlyoneimplementationneedthenbecreated
(b)aprotocoldesignedbycommitteealwayshasbetterperformancethanthatdesignedbyasinglecompanyorresearchproject
(c)differentimplementationscanthencommunicatewitheachother
(d)otherwisesourcecodewouldneedtobeshippedwithallnetworkingapplications
(a)Itisunlikelytobetruethatoneimplementationcanworkwellinallplatformsandsituations,andevenifthisweretrue,standardizationwouldnotmakeitanymorepossible.
6.Whichofthefollowingmethodsareinvokedbyaserverimplementedwithsockets?
(d)
Iconnect()IIlisten()IIIaccept()
(a)I,II,andIII
(b)IIIonly
(c)IIonly
(d)IIandIIIonly
7.Anapplicationonacomputersendsdatathroughasockettoanothercomputer.Whichofthefollowingarespecifiedbythecommunicationprotocol?
(a)
IThecontentsofthemessagebody
IIThespeedoftransmission
IIITheheaderformat,whichspecifiestheheaderfieldsizesandmeanings
(a)IIIonly
(b)IIandIIIonly
(c)Ionly
(d)IandIIIonly
(b)Thespeedoftransmissionmayaffectthecommunication,butitisnotspecifiedbytheprotocol.
8.Whichofthefollowingdistinguishstreamsockets(e.g.,TCP)fromdatagramsockets(e.g.,UDP)?
(b)
Streamsocketsguaranteedeliveryofthedatasentthroughthem.
Streamsocketscanbeusedtosendapplicationdatatoaremotehost,whereasdatagramsocketscanonlysendcontrolcommands.
Streamsocketshavegreateroverhead.
(a)IIandIIIonly
(b)IandIIIonly
(c)Ionly
(d)IandIIonly
9.Allstore-and-forwardnetworksare(d)
(a)connection-basednetworks
(b)broadcastnetworks
(c)connectionlessnetworks
(d)packetormessageswitchednetworks
10.Whichofthefollowingpairsofentitiesnameaclientandoneofitsservers?
(d)
Googlesearchengine/
Webbrowser/Googlesearchengine
Emailclient/Webbrowser
(a)I,II,andIII
(b)IIandIIIonly
(c)IIonly
(d)IandIIonly
(c)Thesearchenginealsohastosearchotherservers.
11.Whydonetworkapplicationssend"messages,"butthenetworktransmitsinformationin"packets?
"(a)
(1)Bufferallocationanderrorhandlingiseasierwhendoneforsmallerchunksofdata.
(2)Multiplemessagescanbesentinasinglelargepackettodecreaseoverhead.
(3)Networkengineersandapplicationprogrammersjustusedifferentterminologyforthesameunitofapplicationdata.
(4)Amessageneedstobepackagedwiththeinstructionstoprocessitatthedestination.
(a)IandIIonly
(b)IIandIVonly
(c)I,II,III,andIV
(d)IIandIIIonly
12.WhichofthefollowingparameterscanbespecifiedintheheaderofarequestintheHypertextTransferProtocol(HTTP)?
(b)
(1)Thetypesofimageformatsthatabrowserunderstands
(2)Thetypeofbrowser(e.g.,Netscape,InternetExplorer)makingtherequest
(3)Themethodbywhichtherequestistobesatisfied—forexample,whethertherequestisaGETofaformsubmission
(a)IIandIIIonly
(b)I,II,andIII
(c)IIIonly
(d)IandIIonly
13.Howdoesanoperatingsystemidentifytheapplicationtowhichdatacominginfromthenetworkshouldberelayed?
(b)
(a)Bytheprotocolwithwhichthedatawassent
(b)Bytheportnumbercarriedbythetransportprotocol
(c)Onlyoneapplicationatatimeisgivenaccesstothenetwork.
(d)Bythefileextensionofthedata
14.WhichofthefollowingarespecifiedbytheHTTPprotocol?
(d)
Thesyntaxoftherequestheader
Thesyntaxoftheresponseheader
Thespecificlegalnamesoftherequestheaderfields
(a)I,II,andIII
(b)Ionly
(c)IandIIIonly
(d)IandIIonly
1.1.2
1.PacketcollisionsoccurinanEthernetnetworkbecause(a)
(a)twoEthernetnodescansendpacketsatthesametime
(b)theEthernetusesaringtopology
(c)twodifferentEthernetnetworksmaybesplicedtogether
(d)theEthernetswitchingmechanismmayoccasionallysendtwopacketsthroughthesameroute
2.PacketcollisionsoccurinanEthernetnetworkbecause(b)
(a)theEthernetswitchingmechanismmayoccasionallysendtwopacketsthroughthesameroute
(b)twoEthernetnodescansendpacketsatthesametime
(c)theEthernetusesaringtopology
(d)twodifferentEthernetnetworksmaybesplicedtogether
3.TwopacketsAandBaresentinthatorderthroughaconnectionlesscommunicationnetwork.Theywillarriveatthedestination(c)
(a)intheorderA-B,afterpossiblyhavingtraverseddifferentroutes
(b)inanyorder,afterhavingtraversedthesameroute
(c)inanyorder,afterpossiblyhavingtraverseddifferentroutes
(d)intheorderA-B,afterhavingtraversedthesameroute
1.1.4
1._____canbeusedtomeasurelatencyinthecommunicationnetwork.(d)
(a)BitErrorRate
(b)Percentageofpacketsretransmitted
(c)Throughput
(d)Roundtriptime
2.ApacketwithnodataissentfromhostAtohostBonanotherwiseidlenetwork.Thepacketisfoundtohavetaken35millisecondstoreachB.Theincrementaloverheadtosendanadditionalbyte(usuallycalledthe"throughput")isestimatedtobefivemicrosecondsbyrepeatedlymeasuringthetransmissiontimesoflongpackets.Approximately,howlongwillaneightKbytes(8192bytes)packettaketoreachBwhensentfromA?
(a)
(a)76milliseconds
(b)cannotbedeterminedfromtheinformationgiven
(c)55milliseconds
(d)40milliseconds
3.Acomputersends100Kbytesofaggregatedatatoanothercomputerthroughthenetwork.Ifthistransmissiontimetakes10secondsandsetuptimeisnegligible,thethroughputofthisnetworkis(a)
(a)intherangefrom60to120Kbps(kilobitspersecond)
(b)intherangefrom6to12Kbps(kilobitspersecond)
(c)exactly10Kbps
(d)notabletobedeterminedwiththeinformationgiven
4.Thetransmissionofhigh-quality,interactivevoiceandvideooverthecurrentInternetisdifficultbecausetoday'sInternet(c)
(a)usesconnectionlessprotocols
(b)giveshigherprioritytobulkdatatransfers
(c)isunabletoguaranteeminimumthroughputormaximumlatencyforagivenconnection
(d)doesnotreallyhavesufficientthroughput
5.ThethroughputofanetworklinkforanHTTPsessionismeasuredintwoways.MeasurementAisthetotalamountofdatareceivedbythebrowser,dividedbythedurationofthesession.MeasurementBisthetotalamountofdatareceivedbytheoperatingsystemonbehalfofthebrowser,dividedbythedurationofthesession.WhichofthefollowingstatementsaboutAandBistrue?
(c)
(a)BissmallerthanA
(b)BandAarenotrelated
(c)AissmallerthanB
(d)BisequaltoA
6.Acomputersends100Kbytesofaggregatedatatoanothercomputerthroughthenetwork.Ifthistransmissiontimetakes10secondsandsetuptimeisnegligible,thethroughputofthisnetworkis(b)
(a)intherangefrom6to12Kbps(kilobitspersecond)
(b)intherangefrom60to120Kbps(kilobitspersecond)
(c)notabletobedeterminedwiththeinformationgiven
(d)exactly10Kbps
7.WesendapacketfromhostAtohostB,whichimmediatelyacknowledgesit.WemeasuretheintervalbetweenthetimethepacketissentbyAanditsacknowledgementisreceived.Thisintervalisfoundtobe180milliseconds.WhatcanbesaidaboutthelatencyofthelinkfromAtoB?
(c)
(a)Itisexactly90ms.
(b)Itisexactly180ms.
(c)Itissmallerthan180ms.
(d)Itisgreaterthan180ms.
1.1.5
1.
(1)WhatcanbesaidabouttheprotocolusedbytheimplementationofthetransportlayerofanInternethost?
(d)
Itguaranteesdelivery.
ItistheTransmissionControlProtocol(TCP).
Itusesservicesprovidedbythesessionlayer.
(a)Ionly
(b)IandIIIonly
(c)IandIIonly
(d)none
(2)WhatcanbesaidconcerningtheprotocolthatisusedbytheimplementationofthenetworklayerofanInternethost?
(b)
Itguaranteesdelivery.
ItistheInternetProtocol(IP).
Itusesservicesprovidedbythesessionlayer.
(a)Ionly
(b)IIonly
(c)IandIIonly
(d)none
2.WhatcanbesaidabouttheprotocolusedbytheimplementationofthetransportlayerofanInternethost?
(b)
Itguaranteesdelivery.
ItistheTransmissionControlProtocol(TCP).
Itusesservicesprovidedbythesessionlayer.
(a)Ionly
(b)none
(c)IandIIIonly
(d)IandIIonly
3.EveryProtocolDataUnit(PDU)thatissentbyaprotocollayertoitsremotepeeronthedestinationsystem
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