CCNA 4 Chapter 3 v50 Exam Answers docxWord文件下载.docx

CCNA 4 Chapter 3 v50 Exam Answers docxWord文件下载.docx

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byusingseparateNCPs*

bynegotiatingwiththenetworklayerhandler

3

Placetheoptionsinthefollowingorder:

Compression 

Multilink 

MaximumReceiveUnit 

–notscored– 

AuthenticationProtocol

4

Whichcommandcanbeusedtoviewthecabletypethatisattachedtoaserialinterface?

Router（config）#showcontrollers*

Router（config）#showipinterface

Router（config）#showinterfaces

Router（config）#showipinterfacebrief

5

InwhichsituationwouldtheuseofPAPbepreferabletotheuseofCHAP?

whenplaintextpasswordsareneededtosimulateloginattheremotehost*

whenrouterresourcesarelimited

whenmultilinkPPPisused

whenanetworkadministratorprefersitbecauseofeaseofconfiguration

6

WhichprotocolwillterminatethePPPlinkaftertheexchangeofdataiscomplete?

IPCP

LCP*

IPXCP

NCP

7

Refertotheexhibit.WhichstatementdescribesthestatusofthePPPconnection?

Boththelink-establishmentandnetwork-layerphasecompletedsuccessfully.*

Onlythenetwork-layerphasecompletedsuccessfully.

Onlythelink-establishmentphasecompletedsuccessfully.

Neitherthelink-establishmentphasenorthenetwork-layerphasecompletedsuccessfully.

8

WhichisanadvantageofusingPPPonaseriallinkinsteadofHDLC?

optionforsessionestablishment

higherspeedtransmission

optionforauthentication*

fixed-sizeframes

9

WhichthreestatementsaretrueaboutPPP?

（Choosethree.）

PPPcanusesynchronousandasynchronouscircuits.*

PPPcarriespacketsfromseveralnetworklayerprotocolsinLCPs.

PPPcanonlybeusedbetweentwoCiscodevices.

PPPusesLCPstoagreeonformatoptionssuchasauthentication,compression,anderrordetection.*

PPPusesLCPstoestablish,configure,andtestthedatalinkconnection.*

10

WhenconfiguringMultilinkPPP,whereistheIPaddressforthemultilinkbundleconfigured?

onasubinterface

onaphysicalserialinterface

onaphysicalEthernetinterface

onamultilinkinterface*

11

WhichfieldmarksthebeginningandendofanHDLCframe?

FCS

Flag*

Control

Data

12

Refertotheexhibit.Basedonthedebugcommandoutputthatisshown,whichstatementistrueoftheoperationofPPP.

BothPAPandCHAPauthenticationwereattempted.

APPPsessionwassuccessfullyestablished.*

CHAPauthenticationfailedbecauseofanunknownhostname.

ThedebugoutputisfromrouterR2.

13

DuringaPPPsessionestablishmentphase,whichtwomessagesaresentbytherequestedpartyiftheoptionsarenotacceptable?

（Choosetwo.）

Configure-Reject*

Code-Reject

Discard-Request

Configure-Nak*

Protocol-Reject

14

AnetworkadministratorisevaluatingauthenticationprotocolsforaPPPlink.WhichthreefactorsmightleadtotheselectionofCHAPoverPAPastheauthenticationprotocol?

usesanunpredictablevariablechallengevaluetopreventplaybackattacks*

usesathree-wayauthenticationperiodicallyduringthesessiontoreconfirmidentities*

transmitslogininformationinencryptedformat*

controlbytheremotehostofthefrequencyandtimingofloginevents

establishesidentitieswithatwo-wayhandshake

makesauthorizednetworkadministratorinterventionarequirementtoestablisheachsession

15

Step3 

Step2 

Step4 

Step1 

Step5 

Step6

16

WhatarethreecomponentsofPPP?

multilink

NCP*

HDLC-likeframing*

compression

authentication

17

Refertotheexhibit.AnetworkadministratorisconfiguringthePPPlinkbetweenthetworouters.However,thePPPlinkcannotbeestablished.Basedonthepartialoutputoftheshowrunning-configcommand,whatisthecauseoftheproblem?

​

Thepasswordsdonotmatch.*

Theusernamesdonotmatch.

Thepasswordsshouldbelongerthan8characters.

TheinterfaceIPaddressesareindifferentsubnets.

18

WhichPPPoptioncandetectlinksthatareinalooped-backcondition?

MagicNumber*

Callback

MRU

ACCM

19

WhichthreearetypesofLCPframesusedwithPPP?

link-negotiationframes

link-acknowledgmentframes

link-maintenanceframes*

link-terminationframes*

link-establishmentframes*

link-controlframes

20

AtwhichlayeroftheOSImodeldoesmultiplexingtakeplace?

Layer3

Layer4

Layer2

Layer1*

21

Phase3 

Phase1 

Phase2

22

Whichthre