ccna3 第2单元章节测试答案

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1、1窗体顶端Refertotheexhibit.Howmanycollisiondomainsaredepictedinthenetwork?124678窗体底端2窗体顶端Refertotheexhibit.Theswitchandworkstationareadministrativelyconfiguredforfull-duplexoperation.Whichstatementaccuratelyreflectstheoperationofthislink?Nocollisionswilloccuronthislink.Onlyoneo

2、fthedevicescantransmitatatime.Theswitchwillhavepriorityfortransmittingdata.Thedeviceswilldefaultbacktohalfduplexifexcessivecollisionsoccur.窗体底端3窗体顶端Whathappenswhenthetransportinputsshcommandisenteredontheswitchvtylines?TheSSHclientontheswitchisenabled.Communicationbetweenth

3、eswitchandremoteusersisencrypted.Ausername/passwordcombinationisnolongerneededtoestablishasecureremoteconnectiontotheswitch.Theswitchrequiresremoteconnectionsviaproprietaryclientsoftware.窗体底端4窗体顶端WhenaswitchreceivesaframeandthesourceMACaddressisnotfoundintheswitchingtable,w

4、hatactionwillbetakenbytheswitchtoprocesstheincomingframe?Theswitchwillrequestthatthesendingnoderesendtheframe.TheswitchwillissueanARPrequesttoconfirmthatthesourceexists.TheswitchwillmapthesourceMACaddresstotheportonwhichitwasreceived.Theswitchendsanacknowledgementframetothe

5、sourceMACofthisincomingframe.窗体底端5窗体顶端WhataretwowaystomakeaswitchlessvulnerabletoattackslikeMACaddressflooding,CDPattacks,andTelnetattacks?(Choosetwo.)EnableCDPontheswitch.Changepasswordsregularly.Turnoffunnecessaryservices.EnabletheHTTPserverontheswitch.Usetheenablepasswor

6、dratherthantheenablesecretpassword.窗体底端6窗体顶端Refertotheexhibit.WhatactiondoesSW1takeonaframesentfromPC_AtoPC_CiftheMACaddresstableofSW1isempty?SW1dropstheframe.SW1floodstheframeonallportsonSW1,exceptportFa0/1.SW1floodstheframeonallportsontheswitch,exceptFa0/23andFa0/1.SW1use

7、stheCDPprotocoltosynchronizetheMACtablesonbothswitchesandthenforwardstheframetoallportsonSW2.窗体底端7窗体顶端Whichstatementistrueaboutthecommandbannerlogin"AuthorizedpersonnelOnly"issuedonaswitch?ThecommandisenteredinprivilegedEXECmode.ThecommandwillcausethemessageAuthorizedperson

8、nelOnlytodisplaybeforeauserlogsin.Thecommandwillgeneratetheerrormessage%Ambiguousc