CCNA思科網(wǎng)絡(luò)學(xué)院練習(xí)

1、CCNA1chapter11、Whichstatementscorrectlyidentifytheroleofintermediarydevicesinthenetwork?(Choosethree.)下列哪些陳述正確指出了中間設(shè)備在網(wǎng)絡(luò)中的作用？determinepathwaysfordata確定數(shù)據(jù)傳輸路徑initiatedatacommunications發(fā)起數(shù)據(jù)通信retimeandretransmitdatasignals重新定時和重新傳輸數(shù)據(jù)信號originatetheflowofdata發(fā)送數(shù)據(jù)流managedataflows管理數(shù)據(jù)流finalterminationpoint

2、fordataflow數(shù)據(jù)流最后的終止點(diǎn)Option1,Option3,andOption5arecorrect.2、Selectthestatementsthatarecorrectconcerningnetworkprotocols.(Choosethree.)選擇關(guān)于網(wǎng)絡(luò)協(xié)議的正確陳述。definethestructureoflayerspecificPDUs定義特定層PDU的結(jié)構(gòu)dictatehowtoaccomplishlayerfunctions規(guī)定實(shí)現(xiàn)協(xié)議層功能的方式outlinethefunctionsnecessaryforcommunicationsbetweenlayer

3、s概述層與層之間通信所需的功能limithardwarecompatibility限制了硬件兼容性requirelayerdependentencapsulations需要取決于協(xié)議層的封裝過程eliminatestandardizationamongvendors杜絕廠商之間的標(biāo)準(zhǔn)化Option1,Option3,andOption5arecorrect3、Whatarethekeyfunctionsofencapsulation?(Choosethree.)封裝的關(guān)鍵功能是什么？allowsmodificationoftheoriginaldatabeforetransmission供傳輸

4、前修改原始數(shù)據(jù)identifiespiecesofdataaspartofthesamecommunication標(biāo)識數(shù)據(jù)片段屬于同一通信enablesconsistentnetworkpathsforcommunication為通信提供統(tǒng)的網(wǎng)絡(luò)路徑ensuresthatdatapiecescanbedirectedtothecorrectreceivingenddevice確保數(shù)據(jù)片段可以轉(zhuǎn)發(fā)到正確的接收端設(shè)備enablesthereassemblyofcompletemessages實(shí)現(xiàn)完整消息的重組tracksdelaybetweenenddevices跟蹤終端設(shè)備之間的延遲Option

5、2,Option4,andOption5arecorrect4、Whatisaprimaryfunctionofthetrailerinformationaddedbythedatalinklayerencapsulation?數(shù)據(jù)鏈路層封裝添加的報尾信息有何主要功能？supportserrordetection支持差錯校驗ensuresorderedarrivalofdata確保數(shù)據(jù)按照順序到達(dá)providesdeliverytocorrectdestination確保送達(dá)正確目的identifiesthedevicesonthelocalnetwork標(biāo)識本地網(wǎng)絡(luò)中的設(shè)備assistsin

6、termediarydeviceswithprocessingandpathselection幫助中間設(shè)備進(jìn)行處理和路徑選擇Option15、WhichtwolayersoftheOSImodelhavethesamefunctionsastheTCP/IPmodelNetworkAccessLayer?(Choosetwo.)OSI模型哪兩層白功能與TCP/IP模型的網(wǎng)絡(luò)接入層相同？NetworkTransportPhysicalDataLinkSessionOption3andOption4arecorrect.6、WhatisaPDU?corruptionofaframeduringtr

7、ansmission傳輸期間的幀損壞datareassembledatthedestination在目的設(shè)備上重組的數(shù)據(jù)retransmittedpacketsduetolostcommunication因通信丟失而重新傳輸?shù)臄?shù)據(jù)包alayerspecificencapsulation特定層的封裝Option47、Whichcharacteristiccorrectlyreferstoenddevicesinanetwork?以下哪種特征正確代表了網(wǎng)絡(luò)中的終端設(shè)備managedataflows管理數(shù)據(jù)流originatedataflow發(fā)送數(shù)據(jù)流retimeandretransmitdatas

8、ignals重新定時和重新傳輸數(shù)據(jù)信號determinepathwaysfordata確定數(shù)據(jù)傳輸路徑Option28、Refertotheexhibit.CellAatIPaddress4hasestablishedanIPsessionwithIPPhone1atIPaddress03.Baseduponthegraphic,whichdevicetypebestdescribesthefunctionofwirelessdeviceCellA?IP地址為4的竽機(jī)A”已經(jīng)與IP地址為03的“IP電t1”建立了IP會話。

9、請根據(jù)圖示回答，下列哪個設(shè)備類型是對無線設(shè)備手機(jī)A”功能的最準(zhǔn)確描述？9、Refertotheexhibit.Whichthreelabelscorrectlyidentifythenetworktypesforthenetworksegmentsthatareshown?(Choosethree.)下列哪三個標(biāo)簽正確標(biāo)識了圖示網(wǎng)段的網(wǎng)絡(luò)類型？(選擇三項)10、WhichthreestatementsbestdescribeaLocalAreaNetwork(LAN)?(Choosethree.)下列哪三項陳述是對局域網(wǎng)(LAN)最準(zhǔn)確的描述？ALANisusuallyinasinglegeo

10、graphicalarea.LAN通常位于一個地域內(nèi)。Thenetworkisadministeredbyasingleorganization.此類網(wǎng)絡(luò)由由一個組織管理TheconnectionbetweensegmentsintheLANisusuallythroughaleasedconnection.LAN中的不同網(wǎng)段之間一般通過租用連接的方式連接Thesecurityandaccesscontrolofthenetworkarecontrolledbyaserviceprovider.此類網(wǎng)絡(luò)的安全和訪問控制由服務(wù)提供商控制。ALANprovidesnetworkservicesan

11、daccesstoapplicationsforuserswithinacommonorganization.LAN為同一個組織內(nèi)的用戶提供網(wǎng)絡(luò)服務(wù)和應(yīng)用程序訪問。EachendofthenetworkisgenerallyconnectedtoaTelecommunicationServiceProvider(TSP).此類網(wǎng)絡(luò)的每個終端通常都連接到電信服務(wù)提供商(TSP)。Option1,Option2,andOption5arecorrect.11、witchnetworkingtermdescribesthedatainterleavingprocessrepresentedinthe

12、graphic?哪個網(wǎng)絡(luò)術(shù)語描述了圖中所示的數(shù)據(jù)交替發(fā)送過程？piping通道PDUstreaming流傳輸multiplexing多路復(fù)用encapsulation12、WhatistheprimarypurposeofLayer4portassignment?第4層端口指定的主要作用是什么toidentifydevicesonthelocalmedia標(biāo)識本地介質(zhì)中的設(shè)備toidentifythehopsbetweensourceanddestination標(biāo)識源設(shè)備和目的設(shè)備之間的跳數(shù)toidentifytotheintermediarydevicesthebestpaththrough

13、thenetwork向中間設(shè)備標(biāo)識通過該網(wǎng)絡(luò)的最佳路徑toidentifythesourceanddestinationenddevicesthatarecommunicating標(biāo)識正在通信的源終端設(shè)備和目的終端設(shè)備toidentifytheprocessesorservicesthatarecommunicatingwithintheenddevices標(biāo)識終端設(shè)備內(nèi)正在通信的進(jìn)程或服務(wù)Option513、Whatdeviceisconsideredanintermediarydevice?哪種設(shè)備被視為中間設(shè)備？fileserverIPphonelaptopprinterswitchOp

14、tion514、Refertotheexhibit.WhichtermcorrectlyidentifiesthedevicetypethatisincludedintheareaB?哪個術(shù)語正確判斷出了包含于綠色區(qū)域中的設(shè)備類型？15、Whichlayerencapsulatesthesegmentintopackets?哪一層負(fù)責(zé)將數(shù)據(jù)段封裝成數(shù)據(jù)包？physicaldatalinknetworktransportOption316、Whatcanbeidentifiedbyexaminingthenetworklayerheader?通過檢查網(wǎng)絡(luò)層報頭可以確定什么？thedestinat

15、iondeviceonthelocalmedia本地介質(zhì)上的目的設(shè)備thedestinationhostaddress用于到達(dá)目的主機(jī)的路徑thebitsthatwillbetransferredoverthemedia將要通過介質(zhì)傳輸?shù)谋忍豻hesourceapplicationorprocesscreatingthedata創(chuàng)建數(shù)據(jù)的源應(yīng)用程序或進(jìn)程Option217、Refertotheexhibit.Whichsetofdevicescontainsonlyenddevices?下列哪組設(shè)備僅包含終端設(shè)備？18、Duringtheencapsulationprocess,whatocc

16、ursatthedatalinklayer?在封裝過程中,數(shù)據(jù)鏈路層執(zhí)行什么操作？Noaddressisadded.不添加地址。Thelogicaladdressisadded.添加邏輯地址。Thephysicaladdressisadded.添加物理地址。Theprocessportnumberisadded.添力進(jìn)程的端口號。Option319、WhatisthepurposeoftheTCP/IPNetworkAccesslayer?TCP/IP網(wǎng)絡(luò)接入層有何作用?pathdeterminationandpacketswitching路徑確定和數(shù)據(jù)包交換datarepresentatio

17、n,encoding,andcontrol數(shù)據(jù)表示、編碼和控制reliability,flowcontrol,anderrordetection可靠性、流量控制和錯誤檢測detailingthecomponentsthatmakeupthephysicallinkandhowtoaccessit詳細(xì)規(guī)定構(gòu)成物理鏈路的組件及其接入方法thedivisionofsegmentsintopackets將數(shù)據(jù)段劃分為數(shù)據(jù)包Option420、WhatistheproperorderofthelayersoftheOSImodelfromthehighestlayertothelowestlayer?O

18、SI模型各層從最高層到最低層的正確順序如何？CCNA1chapter31、Whatapplicationlayerprotocoliscommonlyusedtosupportforfiletransfersbetweenaclientandaserver?哪個應(yīng)用層協(xié)議通常用于支持客戶端與服務(wù)器之間的文件傳輸？HTMLHTTPFTPTelnetOption32、Whataretwoformsofapplicationlayersoftware?(Choosetwo.)應(yīng)用層軟件的兩種形式是什么？applications應(yīng)用程序dialogs對話requestsservices服務(wù)syntax

19、語法Option1andOption4arecorrect.3、Anetworkadministratorisdesigninganetworkforanewbranchofficeoftwenty-fiveusers.Whataretheadvantagesofusingaclient-servermodel?(Choosetwo.)網(wǎng)絡(luò)管理員正在為擁有二十五名用戶的新分公司設(shè)計網(wǎng)絡(luò)。使用客戶端-服務(wù)器模型有哪些優(yōu)勢？centralizedadministration集中管理doesnotrequirespecializedsoftware不需要專用軟件securityiseasiertoe

20、nforce更易于執(zhí)行安全管理lowercostimplementation實(shí)施成本更低providesasinglepointoffailure提供單一故障Option1andOption3arecorrect.4、WhatisthepurposeofresourcerecordsinDNS?資源記錄在DNS中有何作用？temporarilyholdsresolvedentries臨時保存解析的條目usedbytheservertoresolvenames服務(wù)器用其解析域名sentbytheclienttoduringaquery由客戶端在查詢期間發(fā)送passesauthentication

21、informationbetweentheserverandclient在服務(wù)器和客戶端之間傳送身份認(rèn)證信息Option25、WhatistheautomatedservicethatmatchesresourcenameswiththerequiredIPaddress?4各資源名稱與所需IP地址匹配的自動化服務(wù)是什么？SSHFQDNDNSTelnetSMTPOption46、WhatthreeprotocolsoperateattheApplicationlayeroftheOSImodel?(Choosethree.)以下哪三種協(xié)議在OSI模型的應(yīng)用層中工作？ARPDNSPPPSMTPP

22、OPICMPOption2,Option4,andOption5arecorrect.7、Whatarethreepropertiesofpeer-to-peerapplications?(Choosethree.)以下哪三項是點(diǎn)對點(diǎn)應(yīng)用程序的屬性？actsasbothaclientandserverwithinthesamecommunication在同一次通信中既是客戶端也是服務(wù)器requirescentralizedaccountadministration需要集中管理帳戶hybridmodeincludesacentralizeddirectoryoffiles采用混合模式，包括文件集

23、中目錄canbeusedinclient-servernetworks可以在客戶端服務(wù)器網(wǎng)絡(luò)中使用requiresadirectphysicalconnectionbetweendevices不需要專用軟件centralizedauthenticationisrequired需要集中身份認(rèn)證Option1,Option3,andOption4arecorrect.8、Whichapplicationlayerprotocolscorrectlymatchacorrespondingfunction?(Choosetwo.)以下哪些應(yīng)用層協(xié)議正確匹配了相應(yīng)的功能？DNSdynamicallyal

24、locatesIPaddressestohostsDNS為主機(jī)動態(tài)分配IP地址HTTPtransfersdatafromawebservertoaclientHTTP從Web服務(wù)器向客戶端傳輸數(shù)據(jù)POPdeliversemailfromtheclienttotheserveremailserverPOP從客戶端向電子郵件服務(wù)器分發(fā)電子郵件SMTPsupportsfilesharingSMTP支持文件共享TelnetprovidesavirtualconnectionforremoteaccessTelnet提供遠(yuǎn)程訪問的虛擬連接Option2andOption5arecorrect.9、Whi

25、chemailcomponentsareusedtoforwardmailbetweenservers?(Choosetwo.)哪些電子郵件組件用于在服務(wù)器之間轉(zhuǎn)發(fā)郵件？MDAIMAPMTAPOPSMTPMUAOption3andOption5arecorrect.10、AscomparedtoSSH,whatistheprimarydisadvantageoftelnet?與SSH相比，telnet的主要缺點(diǎn)是什么？notwidelyavailable應(yīng)用不廣泛doesnotsupportencryption不支持力口密consumesmorenetworkbandwidth消耗的網(wǎng)絡(luò)帶寬更

26、多doesnotsupportauthentication不支持身份驗證Option211、WhichstatementsarecorrectconcerningtheroleoftheMTAinhandlingemail?(Choosethree.)關(guān)于MTA在處理電子郵件中的作用，下列哪些陳述是正確的？routesemailtotheMDAonotherservers將電子郵件路由到其它服務(wù)器上的MDAreceivesemailfromtheclientsMUA從客戶端的MUA接收電子郵件receivesemailviathePOP3protocol通過POP3協(xié)議接收電子郵件passes

27、emailtotheMDAforfinaldelivery將電子郵件傳送到MDA供最終分發(fā)usesSMTPtorouteemailbetweenservers使用SMTP在服務(wù)器之間路由電子郵件deliversemailtoclientsviathePOP3protocol通過POP3協(xié)議將電子郵件分發(fā)到客戶端Option2,Option4,andOption5arecorrect.12、Whichtwoprotocolsareusedtocontrolthetransferofwebresourcesfromawebservertoaclientbrowser?(Choosetwo.)哪兩項

28、協(xié)議用于控制從Web服務(wù)器向客戶端瀏覽器傳輸Web資源？ASPFTPHTMLHTTPHTTPSIPOption4andOption5arecorrect13、Asmallhomenetworkhasbeeninstalledtointerconnectthreecomputerstogetherforgamingandfilesharing.Whattwopropertiesrepresentthisnetworktype?(Choosetwo.)為了斗各三臺計算機(jī)連接到一起進(jìn)行游戲和文件共享，已經(jīng)安裝了一個小型家庭網(wǎng)絡(luò)。以下哪兩種屬性代表此網(wǎng)絡(luò)類型？Useraccountsarecentra

29、lized.集中管理用戶帳戶。Securityisdifficulttoenforce.難以執(zhí)行安全管理。Specializedoperatingsystemsoftwareisrequired.需要專用的操作系統(tǒng)軟件。Filepermissionsarecontrolledbyasinglecomputer.由臺計算機(jī)控制文件訪問權(quán)限Acomputerthatrespondstoafilesharingrequestisfunctioningasaserver.響應(yīng)文件共享請求的計算機(jī)發(fā)揮服務(wù)器的作用。Option2andOption5arecorrect.14、 Whichlayeroft

30、heOSImodelsuppliesservicesthatallowusertointerfacewiththenetwork?OSI模型哪一層提供的服務(wù)讓用戶可以連接到網(wǎng)絡(luò)？15、 Refertotheexhibit.Whatisthedestinationportforthecommunicationthatisrepresentedonline5?第5行中所示通信的目的端口是多少？16、 Whataretwocharacteristicsofpeer-to-peernetworks?(Choosetwo.)以下哪兩項是點(diǎn)對點(diǎn)網(wǎng)絡(luò)的特征scalable可擴(kuò)展onewaydataflow單

31、向數(shù)據(jù)流decentralizedresources分散資源centralizeduseraccounts集中用戶帳戶resourcesharingwithoutadedicatedserver共享資源時可以不借助專用服務(wù)器Option3andOption5arecorrect17、WhatapplicationlayerprotocoldescribestheservicesthatareusedforfilesharinginMicrosoftnetworks?哪個應(yīng)用層協(xié)議中規(guī)定了Microsoft網(wǎng)絡(luò)中用于文件共享的服務(wù)？DHCPDNSSMBSMTPTelnetOption318、Wh

32、ataretwocharacteristicsofclientsindatanetworks?(Choosetwo.)數(shù)據(jù)網(wǎng)絡(luò)中的客戶端有哪兩種特征？usedaemons使用守護(hù)程序initiatedataexchanges發(fā)起數(shù)據(jù)交換arerepositoriesofdata是數(shù)據(jù)庫mayuploaddatatoservers可以向服務(wù)器上傳數(shù)據(jù)listenforrequestsfromservers偵聽服務(wù)器的請求Option2andOption4arecorrect.19、WhatistheroleoftheOSIapplicationlayer?OSI應(yīng)用層有何作用？providess

33、egmentationofdata提供數(shù)據(jù)分段providesencryptionandconversionofdata提供數(shù)據(jù)力口密和轉(zhuǎn)換providestheinterfacebetweentheapplicationsoneitherendofthenetwork提供網(wǎng)絡(luò)任意終端上應(yīng)用程序之間的接口providescontrolofallthedataflowingbetweenthesourceanddestinationdevices對源設(shè)備和目的設(shè)備之間流經(jīng)的所有數(shù)據(jù)提供控制Option320、Howdoestheapplicationlayeronaserverusuallypr

34、ocessmultipleclientrequestforservices?服務(wù)器上的應(yīng)用層通常如何處理多客戶端服務(wù)請求？ceasesallconnectionstotheservice終止與服務(wù)的所有連接deniesmultipleconnectionstoasingledaemon拒絕與單守護(hù)程序的多個連接suspendsthecurrentconnectiontoallowthenewconnection暫停當(dāng)前連接，建立新連接usessupportfromlowerlayerfunctionstodistinguishbetweenconnectionstotheservice使用下一

35、層功能的支持來區(qū)分不同的服務(wù)連接Option4CCNA1chapter41、Whicheventoccursduringthetransportlayerthree-wayhandshake?以下哪個事件發(fā)生于傳輸層三次握手期間？Thetwoapplicationsexchangedata.兩個應(yīng)用程序交換數(shù)據(jù)。TCPinitializesthesequencenumbersforthesessions.TCP初始化會話的序列號。UDPestablishesthemaximumnumberofbytestobesent.UDP確定要發(fā)送的最大字節(jié)數(shù)。Theserveracknowledgest

36、hebytesofdatareceivedfromtheclient.服務(wù)器確認(rèn)從客戶端接收的數(shù)據(jù)字節(jié)數(shù)。Option22、WithTCP/IPdataencapsulation,whichrangeofportnumbersidentifiesallwell-knownapplications?采用TCP/IP數(shù)據(jù)封裝時，以下哪個端口號范圍標(biāo)識了所有常用應(yīng)用程序？0to255256to10220to10231024to204749153to65535Option33、Refertotheexhibit.HostAisusingFTPtodownloadalargefilefromServer

37、1.Duringthedownloadprocess,Server1doesnotreceiveanacknowledgmentfromHostAforseveralbytesoftransferreddata.WhatactionwillServer1takeasaresult?主機(jī)A正在使用FTP從服務(wù)器1下載大型文件。在下載期間，服務(wù)器1沒有收到主機(jī)A對若干字節(jié)傳輸數(shù)據(jù)的確認(rèn)。服務(wù)器1將默認(rèn)執(zhí)行什么操作？createaLayer1jamsignal創(chuàng)建第1層堵塞信號reachatimeoutandresendthedatathatneedstobeacknowledged至U達(dá)超時時間后

38、重新發(fā)送需要確認(rèn)的數(shù)據(jù)sendaRESETbittothehost向主機(jī)發(fā)送RESET位changethewindowsizeintheLayer4header更改第4層報頭中的窗口大小Option24、DuringaTCPcommunicationsession,ifthepacketsarrivetothedestinationoutoforder,whatwillhappentotheoriginalmessage?在TCP通信會話期間，如果數(shù)據(jù)包到達(dá)目的主機(jī)的順序混亂，將對原始消息執(zhí)行什么操作？Thepacketswillnotbedelivered.數(shù)據(jù)包將無法送達(dá)。Thepacke

39、tswillberetransmittedfromthesource.將從源主機(jī)重新傳輸數(shù)據(jù)包。Thepacketswillbedeliveredandreassembledatthedestination.數(shù)據(jù)包將送達(dá)目的主機(jī)并重組。Thepacketswillbedeliveredandnotreassembledatthedestination.數(shù)據(jù)包將送達(dá)目的主機(jī)但并不重組。Option35、WhyisflowcontrolusedforTCPdatatransfer?將流量控制用于TCP數(shù)據(jù)傳輸?shù)脑蚴鞘裁?？tosynchronizeequipmentspeedforsentdata

40、同步設(shè)備速度以便發(fā)送數(shù)據(jù)tosynchronizeandordersequencenumberssodataissentincompletenumericalorder同步并對序列號排序，從而以完整的數(shù)字順序發(fā)送數(shù)據(jù)topreventthereceiverfrombeingoverwhelmedbyincomingdata防止傳入數(shù)據(jù)耗盡接收方資源tosynchronizewindowsizeontheserver在服務(wù)器上同步窗口大/J、tosimplifydatatransfertomultiplehosts簡化向多臺主機(jī)傳輸數(shù)據(jù)的過程6、Basedonthetransportlayerh

41、eadershowninthediagram,whichofthefollowingstatementsdescribetheestablishedsession?(Choosetwo.)根據(jù)圖中所示的傳輸層報頭回答，以下哪些陳述描述了建立的會話？ThisisaUDPheader.ThiscontainsaTelnetrequest.包含Telnet請求。ThiscontainsaTFTPdatatransfer,包含TFTP數(shù)據(jù)傳輸。ThereturnpacketfromthisremotehostwillhaveanAcknowledgementNumberof43693.從這臺遠(yuǎn)程主機(jī)返

42、回的數(shù)據(jù)包將包含確認(rèn)號43693。ThisisaTCPheader.Option2andOption5arecorrect.7、WhichtwooptionsrepresentLayer4addressing?(Choosetwo.)以下哪兩個選項代表第4層編址？identifiesthedestinationnetwork標(biāo)識目的網(wǎng)絡(luò)identifiessourceanddestinationhosts標(biāo)識源主機(jī)和目的主機(jī)identifiesthecommunicatingapplications標(biāo)識正在通信的應(yīng)用程序identifiesmultipleconversationsbetwee

43、nthehosts標(biāo)識主機(jī)之間的多個會話identifiesthedevicescommunicatingoverthelocalmedia標(biāo)識通過本地介質(zhì)通信的設(shè)備Option3andOption4arecorrect.8、 WhatmechanismisusedbyTCPtoprovideflowcontrolassegmentstravelfromsourcetodestination?TCP擁塞控制從源向目的傳送數(shù)據(jù)段的過程中，TCP使用什么機(jī)制提供流量控制？sequencenumbers序歹U號sessionestablishment會話創(chuàng)建windowsizeacknowledgm

44、ents確認(rèn)Option39、WhichthreefeaturesallowTCPtoreliablyandaccuratelytrackthetransmissionofdatafromsourcetodestination?下列哪三項功能使TCP得以準(zhǔn)確可靠地跟蹤從源設(shè)備到目的設(shè)備的數(shù)據(jù)傳輸？encapsulation封裝flowcontrol流量控制connectionlessservices無連接服務(wù)sessionestablishment會話創(chuàng)建numberingandsequencing編號和定序besteffortdelivery盡力傳輸Option2,Option4,andOp

45、tion5arecorrect.10、 Whatisdynamicallyselectedbythesourcehostwhenforwardingdata?下歹U哪項由源主機(jī)在轉(zhuǎn)發(fā)數(shù)據(jù)時動態(tài)選擇？destinationlogicaladdresssourcephysicaladdressdefaultgatewayaddresssourceportOption411、 Afterawebbrowsermakesarequesttoawebserverthatislisteningtothestandardport,whatwillbethesourceportnumberintheTCPhe

46、aderoftheresponsefromtheserver?Web汶U覽器向偵聽標(biāo)準(zhǔn)端口的Web服務(wù)器發(fā)出請求之后，在服務(wù)器響應(yīng)的TCP報頭中，源端口號是多少？13538010241728Option312、 Whichtransportlayerprotocolprovideslowoverheadandwouldbeusedforapplicationswhichdonotrequirereliabledatadelivery?下列哪個傳輸層協(xié)議提供低開銷傳輸因而可用于不需要可靠數(shù)據(jù)傳輸?shù)膽?yīng)用場合？TCPIPUDPHTTPDNSOption313、Whataretwofeaturesof

47、theUserDatagramProtocol(UDP)?(Choosetwo.)下列哪兩項是用戶數(shù)據(jù)報協(xié)議(UDP)的功能？flowcontrollowoverhead系統(tǒng)開銷低connectionless無連接connection-oriented面向連接sequenceandacknowledgements序歹U和確認(rèn)Option2andOption3arecorrect.15、WhichOSImodellayerisresponsibleforregulatingtheflowofinformationfromsourcetodestination,reliablyandaccurat

48、ely?OSI模型哪一層負(fù)責(zé)規(guī)范信息從源設(shè)備到目的設(shè)備準(zhǔn)確可靠地流動？16、WhichinformationisfoundinboththeTCPandUDPheaderinformation?TCP報頭信息和UDP報頭信息中都包含下列哪項信息？sequencing定序flowcontrol流量控制acknowledgments確認(rèn)sourceanddestinationOption417、WhichisanimportantcharacteristicofUDP?下列哪項是UDP的重要特征？acknowledgementofdatadelivery確認(rèn)數(shù)據(jù)送達(dá)minimaldelaysind

49、atadelivery數(shù)據(jù)傳輸?shù)难舆t最短highreliabilityofdatadelivery數(shù)據(jù)傳輸?shù)母呖煽啃詓ameorderdatadelivery同序數(shù)據(jù)傳輸Option218、Refertotheexhibit.Inline7ofthisWiresharkcapture,whatTCPoperationisbeingperformed?此Wireshark捕獲輸出的第7行中執(zhí)行的是哪一項TCP操作？sessionestablishment會話創(chuàng)建segmentretransmit數(shù)據(jù)段重傳datatransfer數(shù)據(jù)傳輸sessiondisconnect會話斷開Option119

50、、WhyareportnumbersincludedintheTCPheaderofasegment?數(shù)據(jù)段的TCP報頭中為什么包含端口號？toindicatethecorrectrouterinterfacethatshouldbeusedtoforwardasegment指示轉(zhuǎn)發(fā)數(shù)據(jù)段時應(yīng)使用的正確路由器接口toidentifywhichswitchportsshouldreceiveorforwardthesegment標(biāo)識接收或轉(zhuǎn)發(fā)數(shù)據(jù)段時應(yīng)使用的交換機(jī)端口todeterminewhichLayer3protocolshouldbeusedtoencapsulatethedata確定封

51、裝數(shù)據(jù)時應(yīng)使用的第3層協(xié)議toenableareceivinghosttoforwardthedatatotheappropriateapplication讓接收主機(jī)轉(zhuǎn)發(fā)數(shù)據(jù)到適當(dāng)?shù)膽?yīng)用程序toallowthereceivinghosttoassemblethepacketintheproperorder讓接收主機(jī)以正確的順序組裝數(shù)據(jù)包Option4CCNA1chapter51、Whatisthepurposeofadefaultgateway?默認(rèn)網(wǎng)關(guān)有何作用?physicallyconnectsacomputertoanetwork用于物理連接計算機(jī)和網(wǎng)絡(luò)providesapermanen

52、taddresstoacomputer為計算機(jī)提供永久地址identifiesthenetworktowhichacomputerisconnected標(biāo)識計算機(jī)所連接的網(wǎng)絡(luò)identifiesthelogicaladdressofanetworkedcomputeranduniquelyidentifiesittotherestofthenetwork標(biāo)識網(wǎng)絡(luò)計算機(jī)的邏輯地址，并且是網(wǎng)絡(luò)中的唯一標(biāo)識identifiesthedevicethatallowslocalnetworkcomputerstocommunicatewithdevicesonothernetworks允許本地網(wǎng)絡(luò)計算機(jī)

53、和其它網(wǎng)絡(luò)中的設(shè)備通信的設(shè)備標(biāo)識2 、Whattypeofroutingusesinformationthatismanuallyenteredintotheroutingtable?哪種路由使用的信息需要手動輸入路由表中？dynamic動態(tài)interior內(nèi)部staticstandard標(biāo)準(zhǔn)Option33 、Refertotheexhibit.Alldevicesshownintheexhibithavefactorydefaultsettings.Howmanybroadcastdomainsarerepresentedinthetopologythatisshown?圖中顯示的所有設(shè)備

54、均為出廠默認(rèn)設(shè)置。圖示拓?fù)浯矶嗌賯€廣播域？4 、WhichIPpacketfieldwillpreventendlessloops?IP數(shù)據(jù)包的哪個字段用于防止無限循環(huán)？type-of-service服務(wù)類型identification標(biāo)識flags標(biāo)志time-to-live生存時間headerchecksum報頭校驗和Option45 、Refertotheexhibit.Usingthenetworkintheexhibit,whatwouldbethedefaultgatewayaddressforhostAinthenetwork?請參見圖示。如果使用圖示

55、中的網(wǎng)絡(luò)，下列哪一項將成為網(wǎng)絡(luò)中主機(jī)A的默認(rèn)網(wǎng)關(guān)地址？6、Whatisacomponentofaroutingtableentry?以下哪一項是路由表條目的組成部分？theMACaddressoftheinterfaceoftherouter路由器接口的MAC地址thedestinationLayer4portnumber第4層目的端口號thedestinationhostaddress目的主機(jī)地址thenext-hopaddress下一跳地址Option47、InanIPv4environment,whatinformationisusedbytherouterto

56、forwarddatapacketsfromoneinterfaceofaroutertoanother?在IPv4環(huán)境中，路由器根據(jù)什么信息在不同的路由器接口之間轉(zhuǎn)發(fā)數(shù)據(jù)包？destinationnetworkaddress目的網(wǎng)絡(luò)地址sourcenetworkaddress源網(wǎng)絡(luò)地址sourceMACaddress源MAC地址wellknownportdestinationaddress公認(rèn)端口目的地址Option18、WhatinformationisaddedduringencapsulationatOSILayer3?OSI第3層封裝期間添加什么信息？sourceanddestina

57、tionMAC源MAC地址和目的MAC地sourceanddestinationapplicationprotocol源應(yīng)用程序協(xié)議和目的應(yīng)用程序協(xié)議sourceanddestinationportnumber源端口號和目的端口號sourceanddestinationIPaddress源IP地址和目的IP地址Option49Ifthedefaultgatewayisconfiguredincorrectlyonthehost,whatistheimpactoncommunications?如果主機(jī)上的默認(rèn)網(wǎng)關(guān)配置不正確，對通信有何影響？Thehostisunabletocommunicateonthelocalnetwork.該主機(jī)無法在本地網(wǎng)絡(luò)上通信。Thehostcancommunicatewithotherhostsonthelocalnetwork,butisunabletocommunicatewith