English FormC ENetwork v40 Chapter 4Word文件下载.docx

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