思科認(rèn)證考試題庫(kù)

1、CCNA640802V13題庫(kù)試題分析題庫(kù)試題分析題庫(kù)講解題庫(kù)講解：吳老師（艾迪飛CCIE實(shí)驗(yàn)室首發(fā)網(wǎng)站：首發(fā)網(wǎng)站：:bbs..cn1.Whataretworeasonsthatawkadministratwoulduseaccesslists(Choosetwo.)A.tocontrolvtyaccessintoarouterB.tocontrolbroadcasttrafficthrougharouterC.tofiltertraf

2、ficasitpassesthrougharouterD.tofiltertrafficthatiginatesfromtherouterE.toreplacepasswdsasalineofdefenseagainstsecurityincursionsAnswer:AC解釋一下：在VTY線(xiàn)路下應(yīng)用ACL，可以控制從VTY線(xiàn)路進(jìn)來(lái)的tel的流量。也可以過(guò)濾穿越一臺(tái)路由器的流量。2.AdefaultFrameRelayWANisclas

3、sifiedaswhattypeofphysicalwkA.pointtopointB.broadcastmultiaccessC.nonbroadcastmultiaccessD.nonbroadcastmultipointE.broadcastpointtomultipointAnswer:C解釋一下：在默認(rèn)的情況下，幀中繼為非廣播多路訪(fǎng)問(wèn)鏈路。但是也可以通過(guò)子接口來(lái)修改他的網(wǎng)絡(luò)的類(lèi)型。3Refertotheexhibit.Howm

4、anybroadcastdomainsexistintheexhibitedtopologyB.TheIPaddress10.121.16.8isthelocalrouterptusedtofwarddata.C.102istheremoteDLCIthatwillreceivetheinfmation.D.ThiscommisrequiredfallFrameRelayconfigurations.E.Thebroadcastopti

5、onallowspacketssuchasRIPupdatestobefwardedacrossthePVC.Answer:E解釋一下：關(guān)于命令framerelaymapip10.121.16.8102broadcast這個(gè)命令用于手工靜態(tài)添加一條映射，到達(dá)10.121.16.8的流量封裝一個(gè)DLCI號(hào)為102，而且這條PVC是支持廣播的流量的，比如RIP的更新包。因?yàn)樵谀J(rèn)的情況下，幀中繼的網(wǎng)絡(luò)為非廣播的，而RIP在其上是無(wú)法發(fā)包的。

6、8WhichofthefollowingareassociatedwiththeapplicationlayeroftheOSImodel(Choosetwo.)A.pingB.TelC.FTPD.TCPE.IPAnswer:BC解釋一下：在OSI7層模型中位于應(yīng)用層的應(yīng)用有tel和ftp這兩種應(yīng)用。9.Fsecurityreasonsthewkadministratneedstopreventpingsintothecpatewksf

7、romhostsoutsidetheinterwk.WhichprotocolshouldbeblockedwithaccesscontrollistsA.IPB.ICMPC.TCPD.UDPAnswer:B解釋一下：PING命令利用ICMP協(xié)議的echo和echoreplay兩個(gè)報(bào)文來(lái)檢測(cè)鏈路是否連通的。所以如果要阻止PING的流量到網(wǎng)絡(luò)，就只要過(guò)濾掉ICMP的應(yīng)用就可以了。10Refertotheexhibit.Thewkadmin

8、istrathascreatedanewVLANonSwitch1addedhostChostD.TheadministrathasproperlyconfiguredswitchinterfacesFastEther013throughFastEther024tobemembersofthenewVLAN.HoweverafterthewkadministratcompletedtheconfigurationhostAcouldco