CISCOCCNA網(wǎng)絡(luò)工程師題庫(kù)

1、培訓(xùn)大講堂官方Y(jié)Y 頻道：3660mCCNA題庫(kù)考試代號(hào)： 640-802考試時(shí)間：英文110+30=140分鐘通過(guò)分?jǐn)?shù)： 825題庫(kù)版本： V104.4鴻鵠論壇招募CCNA、CCNP答疑講師答疑地點(diǎn)：鴻鵠官方Y(jié)Y頻道3660鴻鵠大講堂：/thread-46172-1-1.htmlCCNA題庫(kù)戰(zhàn)報(bào)交流QQ群：144288127 （500人超級(jí)群）CCNA題庫(kù)戰(zhàn)報(bào)交流區(qū)： /forum-261-1.html1000 G視頻教程免費(fèi)下載：/forum-228-1.htmlCCNA（640-802）題庫(kù)V104.4CCNA（640-802）題庫(kù)V104.4（情人節(jié)版）CCNA 題庫(kù)戰(zhàn)報(bào)500人超級(jí)Q

2、Q群 144288127V104系列是官方的終結(jié)版本，以后不會(huì)再出V105 V106 V108等等CCNA 最新題庫(kù)/最新戰(zhàn)報(bào) 發(fā)布區(qū)： /forum-261-1.html下載官方正版題庫(kù)、看最新考試戰(zhàn)報(bào)，請(qǐng)隨時(shí)關(guān)注 鴻鵠論壇 CCNA考試報(bào)名1900，詳情請(qǐng)聯(lián)系鴻鵠全國(guó)區(qū)十七名客服 QQ 712023090-712023106=更新內(nèi)容：V104.1修正V104中錯(cuò)誤題目，確定經(jīng)典爭(zhēng)議題目答案；V104.2增加拖圖題并可完美模擬考試，VCE題庫(kù)增加中文注釋；V104.3針對(duì)思科CCNA考試變題，更新考試新增題目93Q,更新V104.2實(shí)驗(yàn)題；V104.4增加全文中文注釋，匯總V104.3九次

3、更新，刪除部分舊題目，為目前最新官方正版題庫(kù)；2011.8.1 增加每日新題，修訂部分錯(cuò)誤。2012.2.14 情人節(jié)版增加5道新題，分別是519、520、521、522、523題修改176題、375題、443題、482題答案錯(cuò)誤修改59題、88題、453題、107題、270題注釋錯(cuò)誤增加個(gè)別疑難拖圖題注釋，優(yōu)化實(shí)驗(yàn)題=QUESTION 1When you are logged into a switch, which prompt indicates that you are in privileged mode?(當(dāng)您登錄到交換機(jī)，哪種提示表明你在特權(quán)模式？)A. %B. C. D. $E

4、. #Answer: ESection: Chapter 4: Introduction to Cisco IOSExplanation/Reference:特權(quán)模式就是#提示符QUESTION 2Which command shows system hardware and software version information?(哪些命令顯示系統(tǒng)硬件和軟件的版本信息？)A. show configurationB. show environmentC. show inventoryD. show platformE. show versionAnswer: ESection: Chapt

5、er 4: Introduction to Cisco IOSExplanation/Reference:查看系統(tǒng)的軟件和硬件信息使用的命令是show versionQUESTION 3Cisco Catalyst switches CAT1 and CAT2 have a connection between them using ports FA0/13. An 802. 1Q trunk is configured between the two switches. On CAT1, VLAN 10 is chosen as native, but on CAT2 the native

6、VLAN is not specified.What will happen in this scenario?(思科 Catalyst 交換機(jī) CAT1 和 CAT2 有它們之間的連接使用端口 FA0/13。兩個(gè)交換機(jī)之間用802.1Q中繼配置，CAT1做為VLAN10的主機(jī)，但在 CAT2 上的本地 VLAN 未指定。在這種情況下會(huì)發(fā)生什么？)A. 802.1Q giants frames could saturate the link.B. VLAN 10 on CAT1 and VLAN 1 on CAT2 will send untagged frames.C. A native V

7、LAN mismatch error message will appear.D. VLAN 10 on CAT1 and VLAN 1 on CAT2 will send tagged frames.Answer: CSection: Chapter 10: VLANExplanation/Reference:如果兩邊native不匹配的話.switch將報(bào)native不匹配的日志信息QUESTION 4Which command would correctly configure a serial port on a router with the last usable host add

8、ress in the 2/29 subnet?（哪個(gè)命令正確地將最后的可用主機(jī)地址，2/29 子網(wǎng)的路由器上配置的串行端口？）A. Router(config-if)# ip address 8 40B. Router(config-if)# ip address 9 24C. Router(config-if)# ip address 3 48D. Router(config-if)# ip address 9 48E. Router(config-if)# ip address 3 48F. Router(config-if)# ip address 8 48Answer: FSecti

9、on: Chapter 4: Introduction to Cisco IOSExplanation/Reference:2/29它的塊大小為8掩碼為48地址范圍為2-39QUESTION 5The network default gateway applying to a host by DHCP is 3/28. Which option is the valid IP address of this host?(應(yīng)用到由 DHCP 主機(jī)的網(wǎng)絡(luò)默認(rèn)網(wǎng)關(guān)是 3/28。哪個(gè)選項(xiàng)是有效的主機(jī)IP 地址？)A. 5B. 7C. 0D. 2E. 4Answer: CSection: Chapter

10、 3: IP Addressing and VLSMExplanation/Reference:考點(diǎn)：考查VLSM3/28所在網(wǎng)段的范圍是2-7/28A：超出范圍B：廣播地址C：正確D：網(wǎng)絡(luò)號(hào)E：超出范圍QUESTION 6Which two addresses can be assigned to a host with a subnet mask of ? (Choose two.)哪兩個(gè)地址可以分配給與子網(wǎng)掩碼 的主機(jī)？A. B. C. 55D. 55E. Answer: BDSection: Chapter 3: IP Addressing and VLSMExplanation/Re

11、ference:考點(diǎn)：考查VLSMA：網(wǎng)絡(luò)號(hào)B/D：正確C：廣播地址E：網(wǎng)絡(luò)號(hào)QUESTION 7The network administrator has asked you to check the status of the workstations IP stack by pinging the loopback address. Which address would you ping to perform this task?網(wǎng)絡(luò)管理員已要求您通過(guò) ping 環(huán)回地址檢查工作站的 IP 堆棧的狀態(tài)。您要執(zhí)行此任務(wù)將 ping 哪個(gè)地址？A. B. C. D. Answer: BSe

12、ction: Chapter 3: IP Addressing and VLSMExplanation/Reference:考點(diǎn)：使用ping來(lái)檢測(cè)主機(jī)的IP棧。ping 實(shí)現(xiàn)。QUESTION 8Workstation A has been assigned an IP address of 4/28. Workstation B has been assigned an IP address of 00/28. The two workstations are connected with a straight-through cable. Attempts to ping between

13、 the hosts are unsuccessful. What two things can be done to allow communications between the hosts? (Choose two.)A 工作站已分配 IP 地址為 4/28。B 工作站已分配 IP 地址為 00/28。兩臺(tái)工作站與直通電纜連接。在主機(jī)之間 ping 不成功。允許在主機(jī)之間的通信，可以做兩件事情？（選擇兩個(gè)）。A. Replace the straight-through cable with a crossover cable.B. Change the subnet mask of

14、the hosts to /25.C. Change the subnet mask of the hosts to /26.D. Change the address of Workstation A to 5.E. Change the address of Workstation B to 11.Answer: ABSection: Chapter 3: IP Addressing and VLSMExplanation/Reference:考點(diǎn)：同構(gòu)設(shè)備使用交叉線，兩端的IP需要在同一個(gè)子網(wǎng)。A：使用交叉線替換現(xiàn)有的直通線。正確。B：修改掩碼為25位，正確。C：修改掩碼為26為，錯(cuò)誤。

15、不能使他們?cè)谕粋€(gè)子網(wǎng)。D/E：錯(cuò)誤，都不能使他們?cè)谕粋€(gè)子網(wǎng)。QUESTION 9Your ISP has given you the address /29 to assign to your routers interface. They have also given you the default gateway address of . After you have configured the address, the router is unable to ping any remote devices. What is preventing the router from p

16、inging remote devices?(您的 ISP 給你要分配給您的路由器接口地址 /29。他們還授予您是 的默認(rèn)網(wǎng)關(guān)地址。您已配置了地址后，路由器是無(wú)法 ping 任何遠(yuǎn)程設(shè)備。什么在阻礙 pinging 遠(yuǎn)程設(shè)備的路由器？)A. The default gateway is not an address on this subnet.B. The default gateway is the broadcast address for this subnet.C. The IP address is the broadcast address for this subnet.D.

17、The IP address is an invalid class D multicast address.Answer: BSection: Chapter 3: IP Addressing and VLSMExplanation/Reference:考點(diǎn)：考查VLSM。/29所在網(wǎng)段的范圍是：-/29A：默認(rèn)網(wǎng)關(guān)不屬于這個(gè)子網(wǎng)，錯(cuò)誤B：默認(rèn)網(wǎng)關(guān)是這個(gè)子網(wǎng)的廣播地址，正確C：這個(gè)地址是子網(wǎng)的廣播地址，錯(cuò)誤D：這個(gè)地址是組播地址，錯(cuò)誤。QUESTION 10Which command is used to copy the configuration from RAM into NVRAM?

18、哪個(gè)命令用于從RAM復(fù)制到NVRAM的配置A. copy running-config startup-configB. copy startup-config: running-config:C. copy running config startup configD. copy startup config running configE. write terminalAnswer: ASection: Chapter 4: Introduction to Cisco IOSExplanation/Reference:QUESTION 11Which command is used to

19、load a configuration from a TFTP server and merge the configuration into RAM?(哪些命令用于從 TFTP 服務(wù)器加載配置或合并到 RAM 的配置？)A. copy running-config: TFTP:B. copy TFTP: running-configC. copy TFTP: startup-configD. copy startup-config: TFTP:Answer: BSection: Chapter 4: Introduction to Cisco IOSExplanation/Referenc

20、e:QUESTION 12A system administrator types the command to change the hostname of a router. Where on the Cisco IFS is that change stored?A. NVRAMB. RAMC. FLASHD. ROME. PCMCIAAnswer: BSection: Chapter 4: Introduction to Cisco IOSExplanation/Reference:running-config保存在RAM中startup-config保存在NVRAM中QUESTION

21、 13Which command is used to configure a default route?A. ip route B. ip route C. ip route D. ip route Answer: DSection: Chapter 6: IP RoutingExplanation/Reference:QUESTION 14If IP routing is enabled, which two commands set the gateway of last resort to the default gateway?（如果啟用了 IP 路由，哪兩個(gè)命令設(shè)置網(wǎng)關(guān)的最后到默

22、認(rèn)網(wǎng)關(guān)？）(Choose two.)A. ip default-gateway B. ip route C. ip default-network D. ip default-route E. ip route Answer: CESection: Chapter 6: IP RoutingExplanation/Reference:產(chǎn)生默認(rèn)網(wǎng)關(guān)的兩種方式ip default-networkip routeQUESTION 15Which command would you configure globally on a Cisco router that would allow you to

23、 view directly connected Cisco devices?(該命令將全局上配置使您可以直接查看的 Cisco 路由器連接 Cisco 設(shè)備嗎？)A. enable cdpB. cdp enableC. cdp runD. run cdpAnswer: CSection: Chapter 5: Managing Cisco IOSExplanation/Reference:QUESTION 16Which command is used to see the path taken by packets across an IP network?(哪些命令用于看到通過(guò) IP 網(wǎng)

24、絡(luò)數(shù)據(jù)包所采取的路徑？)A. show ip routeB. show routeC. tracerouteD. trace ip routeAnswer: CSection: Chapter 2: TCP/IPExplanation/Reference:哪條命令用于查看數(shù)據(jù)包轉(zhuǎn)發(fā)所經(jīng)過(guò)的路徑A:查看路由表B：沒有這條命令C：正確D：沒這條命令QUESTION 17Which command is used to debug a ping command?哪些命令用于調(diào)試 ping 命令？A. debug icmpB. debug ip icmpC. debug tcpD. debug pac

25、ketAnswer: BSection: Chapter 5: Managing Cisco IOSExplanation/Reference:ping調(diào)用了icmp協(xié)議，而icmp數(shù)據(jù)包封裝在ip包中。QUESTION 18Which command displays CPU utilization?哪個(gè)命令顯示的 CPU 利用率呢？A. show protocolsB. show processC. show systemD. show versionAnswer: BSection: Chapter 5: Managing Cisco IOSExplanation/Reference:查

26、看CPU利用率。QUESTION 19When configuring a serial interface on a router, what is the default encapsulation?在配置一個(gè)串行接口的路由器，什么是默認(rèn)的封裝？A. atm-dxiB. frame-relayC. hdlcD. lapbE. pppAnswer: CSection: Chapter 14: Wide Area Network (WAN)Explanation/Reference:缺省封裝是HDLCQUESTION 20What must be set correctly when conf

27、iguring a serial interface so that higher-level protocols calculate the best route?什么時(shí)，必須設(shè)置正確配置串行接口，以便更高級(jí)別的協(xié)議計(jì)算最佳路線？A. bandwidthB. delayC. loadD. reliabilityAnswer: ASection: Chapter 6: IP RoutingExplanation/Reference:為了使高層路由協(xié)議計(jì)算最佳路由，串口的什么東西必須被設(shè)置正確？在接口下，只有帶寬是可以配置的。QUESTION 21A company implements vid

28、eo conferencing over IP on their Ethernet LAN. The users notice that the network slows down, and the video either stutters or fails completely. What is the most likely reason for this?公司對(duì)他們的以太網(wǎng) LAN ip 實(shí)現(xiàn)視頻會(huì)議。用戶注意網(wǎng)絡(luò)變慢，和視頻斷斷續(xù)續(xù)或完全失敗。最有可能的原因是什么？A. minimum cell rate (MCR)B. quality of service (QoS)C. mod

29、ulationD. packet switching exchange (PSE)E. reliable transport protocol (RTP)Answer: BSection: Chapter 9: SwitchingExplanation/Reference:考點(diǎn)：當(dāng)網(wǎng)絡(luò)中使用視頻會(huì)議后發(fā)現(xiàn)網(wǎng)絡(luò)非常慢，什么原因引起的？QoS：用于定制策略對(duì)不同流量進(jìn)行控制。QUESTION 22Which layer in the OSI reference model is responsible for determining the availability of the receivin

30、g program and checking to see if enough resources exist for that communication?OSI 參考模型在哪一層負(fù)責(zé)確定接收程序的可用性和檢查足夠的資源，是否存在該通信？A. transportB. networkC. presentationD. sessionE. applicationAnswer: ESection: Chapter 1: IntroductionExplanation/Reference:哪一層確定的接收程序的可用性？應(yīng)用層提供QUESTION 23Data transfer is slow bet

31、ween the source and destination. The quality of service requested by the transport layer in the OSI reference model is not being maintained. To fix this issue, at which layer should the troubleshooting process begin?數(shù)據(jù)傳輸速度慢的源和目標(biāo)之間。不保持在 OSI 參考模型的傳輸層所要求的服務(wù)質(zhì)量。要解決此問(wèn)題，在哪一層應(yīng)故障排除過(guò)程開始？A. presentationB. sess

32、ionC. transportD. networkE. physicalAnswer: DSection: Chapter 1: IntroductionExplanation/Reference:解決網(wǎng)絡(luò)問(wèn)題，先確保網(wǎng)絡(luò)層通信。QUESTION 24Which protocols are found in the network layer of the OSI reference model and are responsible for path determination and traffic switching?哪些協(xié)議在網(wǎng)絡(luò)層 OSI 參考模型中找到，負(fù)責(zé)路徑測(cè)定和交通切換？A.

33、 LANB. routingC. WAND. networkAnswer: BSection: Chapter 1: IntroductionExplanation/Reference:OSI網(wǎng)絡(luò)層中什么提供了路徑選擇和流量轉(zhuǎn)發(fā)？由路由協(xié)議提供。通過(guò)手工或者動(dòng)態(tài)學(xué)習(xí)路由條目實(shí)現(xiàn)。QUESTION 25Which command reveals the last method used to powercycle a router?A. show reloadB. show bootC. show running-configD. show versionAnswer: DSection: Ch

34、apter 5: Managing Cisco IOSExplanation/Reference:哪一個(gè)命令可以顯示最近一次被用來(lái)重啟路由器的方法？QUESTION 26Which three options are valid WAN connectivity methods? (Choose three.)A. PPPB. WAPC. HDLCD. MPLSE. L2TPv3F. ATMAnswer: ACFSection: Chapter 14: Wide Area Network (WAN)Explanation/Reference:哪三種封裝屬于WAN鏈路的?A:點(diǎn)到點(diǎn)協(xié)議，正確B：

35、無(wú)線加密技術(shù)，錯(cuò)誤C:思科缺省封裝格式，正確。D：多協(xié)議標(biāo)簽轉(zhuǎn)換，錯(cuò)誤E：隧道協(xié)議，錯(cuò)誤F：正確。QUESTION 27Refer to the exhibit. Which WAN protocol is being used?A. ATMB. HDLCC. Frame RelayD. PPPAnswer: CSection: Chapter 14: Wide Area Network (WAN)Explanation/Reference:由圖中的紅線可看到發(fā)送接受LMI信息。屬于FR的數(shù)據(jù)包。QUESTION 28What is the difference between a CSU/D

36、SU and a modem?【一個(gè)CSU/DSU和調(diào)制解調(diào)器之間的區(qū)別是什么？】A. A CSU/DSU converts analog signals from a router to a leased line; a modem converts analog signals from a router to a leased line.B. A CSU/DSU converts analog signals from a router to a phone line; a modem converts digital signals from a router to a leased

37、line.C. A CSU/DSU converts digital signals from a router to a phone line; a modem converts analog signals from a router to a phone line.D. A CSU/DSU converts digital signals from a router to a leased line; a modem converts digital signals from a router to a phone line.Answer: DSection: Chapter 14: W

38、ide Area Network (WAN)Explanation/Reference:CSU/DSU一般是專線，MODEN是將模擬信號(hào)與數(shù)字信號(hào)轉(zhuǎn)換QUESTION 29A network administrator must configure 200 switch ports to accept traffic from only the currently attached host devices. What would be the most efficient way to configure MAC-level security on all these ports?A. Vi

39、sually verify the MAC addresses and then telnet to the switches to enter the switchport-port security mac-address command.B. Have end users e-mail their MAC addresses. Telnet to the switch to enter the switchport-port security mac-address command.C. Use the switchport port-security MAC address stick

40、y command on all the switch ports that have end devices connected to them.有端設(shè)備連接到他們的所有交換機(jī)端口上使用交換機(jī)端口端口安全 MAC 地址粘滯命令。D. Use show mac-address-table to determine the addresses that are associated with each port and then enter the commands on each switch for MAC address port-security.Answer: CSection: Ch

41、apter 9: SwitchingExplanation/Reference:考點(diǎn)：有200臺(tái)主機(jī)需要接入，采用什么方式來(lái)增強(qiáng)網(wǎng)絡(luò)安全性？A：先驗(yàn)證mac安全性，然后在交換機(jī)上綁定。錯(cuò)誤，工作量太大B：用戶發(fā)送郵件認(rèn)證再在交換機(jī)上配置，錯(cuò)誤，不科學(xué)。C：使用port-security，正確。D：錯(cuò)誤，工作量太大。QUESTION 30When troubleshooting a Frame Relay connection, what is the first step when performing a loopback test?【幀中繼連接故障排除時(shí)，執(zhí)行環(huán)回測(cè)試時(shí)的第一步是什么？】A

42、. Set the encapsulation of the interface to HDLC.B. Place the CSU/DSU in local-loop mode.C. Enable local-loop mode on the DCE Frame Relay router.D. Verify that the encapsulation is set to Frame Relay.Answer: ASection: Chapter 14: Wide Area Network (WAN)Explanation/Reference:在對(duì)FR進(jìn)行排錯(cuò)的時(shí)候，當(dāng)做回環(huán)測(cè)試的時(shí)候，第一步

43、如何處理？A：講接口配置成HDLC，正確，F(xiàn)R封裝下無(wú)法正常ping自己端口QUESTION 31What occurs on a Frame Relay network when the CIR is exceeded?A. All TCP traffic is marked discard eligible.B. All UDP traffic is marked discard eligible and a BECN is sent.C. All TCP traffic is marked discard eligible and a BECN is sent.D. All traffi

44、c exceeding the CIR is marked discard eligible.Answer: DSection: Chapter 14: Wide Area Network (WAN)Explanation/Reference:在FR網(wǎng)絡(luò)中，當(dāng)CIR超過(guò)時(shí)會(huì)發(fā)生什么情況？D：所有超過(guò)的流量都丟棄。QUESTION 32What are two characteristics of Frame Relay point-to-point subinterfaces? (Choose two.)A. They create split-horizon issues.B. They r

45、equire a unique subnet within a routing domain.C. They emulate leased lines.D. They are ideal for full-mesh topologies.E. They require the use of NBMA options when using OSPF.Answer: BCSection: Chapter 14: Wide Area Network (WAN)Explanation/Reference:幀中繼點(diǎn)到點(diǎn)子接口的特點(diǎn)？A：水平分割，錯(cuò)誤。B：每個(gè)子接口需要一個(gè)獨(dú)立的網(wǎng)段，正確。C：類似專線

46、，正確。D:全網(wǎng)互聯(lián)是理想拓?fù)洌e(cuò)誤。通常是hub-spokeE：NBMA不支持OSPF，錯(cuò)誤。QUESTION 33Refer to the exhibit. Addresses within the range /24 are not being translated to the 1.128.0/16 range. Which command shows if /24 are allowed inside addresses?A. debug ip natB. show access-listC. show ip nat translationD. show ip nat statist

47、icsAnswer: BSection: Chapter 8: NATExplanation/Reference:那條命令可以看到/24是否在允許轉(zhuǎn)換范圍。允許的范圍是通過(guò)ACL定義的。A：打開NAT轉(zhuǎn)換的debug信息，錯(cuò)誤B：查看acl信息，正確。C：查看NAT轉(zhuǎn)換表，錯(cuò)誤。D：查看靜態(tài)NAT。錯(cuò)誤QUESTION 34A wireless client cannot connect to an 802.11b/g BSS with a b/g wireless card. The client section of the access point does not list any a

48、ctive WLAN clients. What is a possible reason for this?一臺(tái)帶有b/g無(wú)線網(wǎng)上的無(wú)線客戶機(jī)不能連接到一個(gè)8020.11b/g 的基站?？蛻舳瞬糠譀]有發(fā)現(xiàn)可用的無(wú)線局域網(wǎng)。這種情況是什么原因？A. The incorrect channel is configured on the client.B. The clients IP address is on the wrong subnet.C. The client has an incorrect pre-shared key.D. The SSID is configured inco

49、rrectly on the client.Answer: DSection: Chapter 11: WirelessExplanation/Reference:客戶端無(wú)法連接到無(wú)限接入點(diǎn)，查看不到可用的無(wú)線信號(hào)。這通常是SSID信號(hào)沒有配置正確。A：不正確的信道。錯(cuò)誤B：客戶端的IP地址配置錯(cuò)誤C：客戶端的共享key錯(cuò)誤。D：SSID配置不正確。QUESTION 35Which two features did WPAv1 add to address the inherent weaknesses found in WEP? (Choose two.)哪兩個(gè)功能 WPAv1 沒有添加地址

50、找到 wep 的固有弱點(diǎn)？（選擇兩個(gè)A. a stronger encryption algorithmB. key mixing using temporal keysC. shared key authenticationD. a shorter initialization vectorE. per frame sequence countersAnswer: BESection: Chapter 11: WirelessExplanation/Reference:考點(diǎn)：WPA1中增強(qiáng)哪兩個(gè)在WEP中發(fā)現(xiàn)的弱點(diǎn)？WEP存在的隱患主要是依賴共享密鑰A：更強(qiáng)的加密算法B：混合使用的密鑰C：共

51、享密鑰認(rèn)證D：較短的初始化向量E：一個(gè)幀一個(gè)序列計(jì)數(shù)器。QUESTION 36Which two wireless encryption methods are based on the RC4 encryption algorithm? (Choose two.)A. WEPB. CCKMC. AESD. TKIPE. CCMPAnswer: ADSection: Chapter 11: WirelessExplanation/Reference:考點(diǎn)：哪兩種無(wú)限加密技術(shù)依賴RC4A:有線等效保密協(xié)議B：英特爾開發(fā)一種協(xié)議C：高級(jí)加密標(biāo)準(zhǔn)D：暫時(shí)密鑰集成協(xié)議E:基于AES的加密方式QUEST

52、ION 37What are two characteristics of RIPv2? (Choose two.)A. classful routing protocolB. variable-length subnet masksC. broadcast addressingD. manual route summarizationE. uses SPF algorithm to compute pathAnswer: BDSection: Chapter 6: IP RoutingExplanation/Reference:A：有類路由協(xié)議，錯(cuò)誤B：可變長(zhǎng)度子網(wǎng)掩碼，正確C：采用廣播地址

53、更新，錯(cuò)誤D：手動(dòng)路由匯總，正確E:使用spf算法計(jì)算路徑，錯(cuò)誤。QUESTION 38Which two Ethernet fiber-optic modes support distances of greater than 550 meters?A. 1000BASE-CXB. 100BASE-FXC. 1000BASE-LXD. 1000BASE-SXE. 1000BASE-ZXAnswer: CESection: Chapter 1: IntroductionExplanation/Reference:A：最長(zhǎng)距離25米B：最長(zhǎng)距離100米C：最長(zhǎng)距離3000米D：最長(zhǎng)距離550米E

54、：最長(zhǎng)距離70千米QUESTION 39What two things will a router do when running a distance vector routing protocol? (Choose two.)A. Send periodic updates regardless of topology changes.B. Send entire routing table to all routers in the routing domain.C. Use the shortest-path algorithm to the determine best path.D

55、. Update the routing table based on updates from their neighbors.E. Maintain the topology of the entire network in its database.Answer: ADSection: Chapter 6: IP RoutingExplanation/Reference:考點(diǎn)：考查距離矢量路由協(xié)議特性A：周期性更新，正確B：發(fā)送整個(gè)路由表到整個(gè)路由域，錯(cuò)誤，只發(fā)送給鄰居C：使用SPF算法，錯(cuò)誤D：依靠鄰居發(fā)送更新來(lái)更新路由表，正確E：在數(shù)據(jù)庫(kù)中維護(hù)整個(gè)網(wǎng)絡(luò)的拓?fù)?。錯(cuò)誤QUESTION 4

56、0Refer to the exhibit. According to the routing table, where will the router send a packet destined for5?A. B. C. D. Answer: CSection: Chapter 6: IP RoutingExplanation/Reference:路由查找原則：最長(zhǎng)掩碼匹配原則。QUESTION 41Which command shows if an access list is assigned to an interface?A. show ip interface interfac

57、e access-listsB. show ip access-lists interface interfaceC. show ip interface interfaceD. show ip access-lists interfaceAnswer: CSection: Chapter 7: SecurityExplanation/Reference:QUESTION 42Refer to the exhibit. Which rule does the DHCP server use when there is an IP address conflict?A. The address

58、is removed from the pool until the conflict is resolved.B. The address remains in the pool until the conflict is resolved.C. Only the IP detected by Gratuitous ARP is removed from the pool.D. Only the IP detected by Ping is removed from the pool.E. The IP will be shown, even after the conflict is re

59、solved.Answer: ASection: Chapter 5: Managing Cisco IOSExplanation/Reference:show ip dhcp conflict命令可以查看哪些ip地址在使用上有沖突。有沖突的地址不再分配出去。A：地址被刪除直到?jīng)_突解決，正確B:地址保留直到?jīng)_突解決，錯(cuò)誤C/D：答案片面。E：當(dāng)沖突解決后，地址會(huì)被顯示。錯(cuò)誤。QUESTION 43Refer to the exhibit. You are connected to the router as user Mike. Which command allows you to seeo

60、utput from the OSPF debug command?A. terminal monitorB. show debuggingC. show sessionsD. show ip ospf interfaceAnswer: ASection: Chapter 6: IP RoutingExplanation/Reference:A：讓debug信息在終端上顯示出來(lái)B：沒這條命令C：查看會(huì)話信息。D:查看啟用了ospf的接口的相關(guān)信息。QUESTION 44Refer to the exhibit. If number 2 is selected from the setup sc