English FormC ENetwork v40 Chapter 4Word文件下载.docx
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English FormC ENetwork v40 Chapter 4Word文件下载.docx
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窗体底端
Reset
Observable
Description
MaxValue
1
correctnessofresponse
Option2andOption5arecorrect.
1pointforeachcorrectoption.
0pointsifmoreoptionsareselectedthanrequired.
2
WithTCP/IPdataencapsulation,whichrangeofportnumbersidentifiesallwell-knownapplications?
0to255
256to1022
0to1023
1024to2047
49153to65535
2pointsforOption3
0pointsforanyotheroption
WhyareportnumbersincludedintheTCPheaderofasegment?
toindicatethecorrectrouterinterfacethatshouldbeusedtoforwardasegment
toidentifywhichswitchportsshouldreceiveorforwardthesegment
todeterminewhichLayer3protocolshouldbeusedtoencapsulatethedata
toenableareceivinghosttoforwardthedatatotheappropriateapplication
toallowthereceivinghosttoassemblethepacketintheproperorder
2pointsforOption4
∙4.1.1PurposeoftheTransportLayer
WhichOSImodellayerisresponsibleforregulatingtheflowofinformationfromsourcetodestination,reliablyandaccurately?
application
presentation
session
transport
network
∙3.3.1DNSServicesandProtocol
Refertotheexhibit.HostAisusingFTPtodownloadalargefilefromServer1.Duringthedownloadprocess,Server1doesnotreceiveanacknowledgmentfromHostAforseveralbytesoftransferreddata.WhatactionwillServer1takeasaresult?
createaLayer1jamsignal
reachatimeoutandresendthedatathatneedstobeacknowledged
sendaRESETbittothehost
changethewindowsizeintheLayer4header
2pointsforOption2
∙4.3.4TCPCongestionControl-MinimizingSegmentLoss
WhyisflowcontrolusedforTCPdatatransfer?
tosynchronizeequipmentspeedforsentdata
tosynchronizeandordersequencenumberssodataissentincompletenumericalorder
topreventthereceiverfrombeingoverwhelmedbyincomingdata
tosynchronizewindowsizeontheserver
tosimplifydatatransfertomultiplehosts
∙1.5.1WhereIsItAllGoing?
WhichtwooptionsrepresentLayer4addressing?
identifiesthedestinationnetwork
identifiessourceanddestinationhosts
identifiesthecommunicatingapplications
identifiesmultipleconversationsbetweenthehosts
identifiesthedevicescommunicatingoverthelocalmedia
Option3andOption4arecorrect.
∙4.2.4TCPThree-WayHandshake
Refertotheexhibit.Inline7ofthisWiresharkcapture,whatTCPoperationisbeingperformed?
sessionestablishment
segmentretransmit
datatransfer
sessiondisconnect
2pointsforOption1
∙4.5.1ObservingTCPandUDPusingNetstat
Refertotheexhibit.Whattwopiecesofinformationcanbedeterminedfromtheoutputthatisshown?
Thelocalhostisusingthreeclientsessions.
Thelocalhostisusingwebsessionstoaremoteserver.
ThelocalhostislisteningforTCPconnectionsusingpublicaddresses.
Thelocalhostisusingwell-knownportnumberstoidentifythesourceports.
Thelocalhostisperformingthethree-wayhandshakewith192.168.1.101:
1037.
Option1andOption2arecorrect.
Whatisdynamicallyselectedbythesourcehostwhenforwardingdata?
destinationlogicaladdress
sourcephysicaladdress
defaultgatewayaddress
sourceport
∙4.4.1UDP-LowOverheadvs.Reliability
WhataretwofeaturesoftheUserDatagramProtocol(UDP)?
flowcontrol
lowoverhead
connectionless
connection-oriented
sequenceandacknowledgements
Option2andOption3arecorrect.
WhatmechanismisusedbyTCPtoprovideflowcontrolassegmentstravelfromsourcetodestination?
sequencenumbers
windowsize
acknowledgments
Whichtransportlayerprotocolprovideslowoverheadandwouldbeusedforapplicationswhichdonotrequirereliabledatadelivery?
TCP
IP
UDP
HTTP
DNS
∙4.1RolesoftheTransportLayer
WhichinformationisfoundinboththeTCPandUDPheaderinformation?
sequencing
sourceanddestinationport
∙4.1.2ControllingtheConversations
WhichthreefeaturesallowTCPtoreliablyandaccuratelytrackthetransmissionofdatafromsourcetodestination?
(Choosethree.)
urgentpointer
besteffortdelivery
connectionlessservices
numberingandsequencing
Option1,Option4,andOption6arecorrect.
3
∙3.1.1OSIandTCP/IPModel
DuringaTCPcommunicationsession,ifthepacketsarrivetothedestinationoutoforder,whatwillhappentotheoriginalmessage?
Thepacketswillnotbedelivered.
Thepacketswillberetransmittedfromthesource.
Thepacketswillbedeliveredandreassembledatthedestination.
Thepacketswillbedeliveredandnotreassembledatthedestination.
WhichisanimportantcharacteristicofUDP?
acknowledgementofdatadelivery
minimaldelaysindatadelivery
highreliabilityofdatadelivery
sameorderdatadelivery
∙4.2.2TCPServerProcesses
Afterawebb
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