【正文】 Host ()的地址，..。接下來(lái)我們來(lái)看交換機(jī)上的接口的vlan分配：和host A相連的接口f0/6劃分到了vlan 10，而和host B相連的接口f0/9劃分到了vlan 20。 of the following describe private IP addresses? (Choose two.) A. addresses chosen by a pany to municate with the Internet B. addresses that cannot be routed through the public Internet C. addresses that can be routed through the public Internet D. a scheme to conserve public addresses E. addresses licensed to enterprises or ISPs by an Internet registry organization Answer: BD解釋一下：私有IP地址是不能在公網(wǎng)上傳遞的。 which circumstance are multiple copies of the same unicast frame likely to be transmitted in a switched LAN? A. during high traffic periods B. after broken links are reestablished C. when upperlayer protocols require high reliability D. in an improperly implemented redundant topology E. when a dual ring topology is in use Answer: D解釋一下：在一個(gè)LAN中有若干的單播幀的拷貝。3．如果在NVRAM的配置文件中沒(méi)有找到boot system命令，引導(dǎo)程序使用flash中所找到的第一個(gè)有效的IOS鏡像。1．路由器在POST后，先查看寄存器的值，這個(gè)值是一組4個(gè)十六進(jìn)制的數(shù)字，而其中的最后的一位影響啟動(dòng)的過(guò)程。這些應(yīng)該就都是他分割一個(gè)網(wǎng)絡(luò)的好處了。59. Refer to the exhibit. The network administrator requires easy configuration options and minimal routing protocol traffic. What two options provide adequate routing table information for traffic that passes between the two routers and satisfy the requests of the network administrator? (Choose two.) A. a dynamic routing protocol on InternetRouter to advertise all routes to CentralRouter. B. a dynamic routing protocol on InternetRouter to advertise summarized routes to CentralRouter. C. a static route on InternetRouter to direct traffic that is destined for D. a dynamic routing protocol on CentralRouter to advertise all routes to InternetRouter. E. a dynamic routing protocol on CentralRouter to advertise summarized routes to InternetRouter. F. a static, default route on CentralRouter that directs traffic to InternetRouter. Answer: CF解釋一下：因?yàn)樵谶@個(gè)圖中,internetRouter要訪問(wèn)內(nèi)網(wǎng) 。Switch1收到廣播后也泛洪，因此一個(gè)廣播環(huán)路就產(chǎn)生了，所以在感覺(jué)網(wǎng)絡(luò)性能很差，因?yàn)閺V播的流量占有了很大的帶寬。就像是以太網(wǎng)中的MAC和IP的映射一樣，通過(guò)DLCI100可以找到IP 。而他們的這些功能都是HDLC所沒(méi)有的。49. Refer to the exhibit. Router1 was just successfully rebooted. Identify the current OSPF router ID for Router1. A. B. C. D. Answer: C解釋一下：這是個(gè)關(guān)于OSPF的RID的選舉的問(wèn)題。他的metric的計(jì)算方式和RIPv1的相同，仍然是根據(jù)跳數(shù)的，但是他的跳數(shù)范圍擴(kuò)大了，RIPv1的為16跳，而RIPv2的為255跳。而HOST B的VLAN2到交換機(jī)是沒(méi)有相同的VLAN 接口和他通訊的，所以HOST B發(fā)出的數(shù)據(jù)到交換機(jī)上就被丟棄了。在一臺(tái)路由器上需要為每個(gè)進(jìn)程維護(hù)各自的OSPF數(shù)據(jù)庫(kù)。 troubleshooting a connectivity problem, a network administrator notices that a port status LED on a Cisco Catalyst series switch is alternating green and amber. Which condition could this indicate? A. The port is experiencing errors. B. The port is administratively disabled. C. The port is blocked by spanning tree. D. The port has an active link with normal traffic activity. Answer: A解釋一下：CISCO交換機(jī)的端口狀態(tài)指示燈是閃爍的綠色和淺黃色，表示端口有操作的問(wèn)題——也許是過(guò)量的錯(cuò)誤或連接的問(wèn)題?？梢钥吹浇涌诘腗AC地址，表示這個(gè)接口肯定不是串行接口，所以可以排除D和E的選項(xiàng)。34. Refer to the exhibit. The two exhibited devices are the only Cisco devices on the network. The serial network between the two devices has a mask of . Given the output that is shown, what three statements are true of these devices? (Choose three.) A. The Manchester serial address is . B. The Manchester serial address is . C. The London router is a Cisco 2610. D. The Manchester router is a Cisco 2610. E. The CDP information was received on port Serial0/0 of the Manchester router. F. The CDP information was sent by port Serial0/0 of the London router. Answer: ACE解釋一下：ＣＤＰ是ＣＩＳＣＯ私有的一個(gè)二層的協(xié)議，但是他卻可以發(fā)現(xiàn)三層的ＩＰ信息的．通過(guò)ＣＤＰ可以發(fā)現(xiàn)的鄰居的信息有：設(shè)備的名稱(chēng)，ＩＰ地址，端口，能力，平臺(tái)，對(duì)端的holddown time．在上圖的show cdp entry *命令的顯示可以看到的信息有：設(shè)備名稱(chēng)：Ｌondon；ＩＰ地址：；平臺(tái)：cisco 2610；能力：Router；端口：s0/１；holdtime：１２５Ｓ．Ｍanchesteter收到這個(gè)ＣＤＰ信息的接口為S0/0．綜合一下，這個(gè)題目的答案就出來(lái)了．35. A network administrator has configured two switches, named London and Madrid, to use VTP. However, the switches are not sharing VTP messages. Given the mand output shown in the graphic, why are these switches not sharing VTP messages? A. The VTP version is not correctly configured. B. The VTP operating mode is not correctly configured. C. The VTP domain name is not correctly configured. D. VTP pruning mode is disabled. E. VTP V2 mode is disabled. F. VTP traps generation is disabled. Answer: C解釋一下：交換機(jī)間不能共享VTP的信息，我們就需要檢查VTP的狀態(tài)，首先需要檢查的是VTP的域名，只有同一個(gè)域中的才可能相互學(xué)習(xí)，再來(lái)檢查VTP的模式，必須有一個(gè)server模式才能有VTP學(xué)習(xí)的過(guò)程的，默認(rèn)的情況下VTP的模式為Server的。每條鏈路都需要有一個(gè)DP，先是比較花費(fèi)，如果花費(fèi)相同則比較BID（橋優(yōu)先級(jí)），仍是越小越優(yōu)先，根據(jù)上圖的表識(shí)，我們可以找到每條鏈路上的DP，而連Printers的鏈路上的DP就為Switch 3，因?yàn)樗懈〉腗AC地址。所以我們通過(guò)上圖可以找到根橋?yàn)閟witch 1。所以在這兒，Switch 1也采取的上泛洪的方式。25. In the implementation of VLSM techniques on a network using a single Class C IP address, which subnet mask is the most efficient for pointtopoint serial links? A. B. C. D. E. Answer: D解釋一下：在點(diǎn)到點(diǎn)的鏈路上因?yàn)橹恍枰峙鋬蓚€(gè)地址給兩端就可以了，所以加上網(wǎng)絡(luò)地址和廣播地址，這個(gè)網(wǎng)段也就只需要有4個(gè)地址了，所以網(wǎng)絡(luò)位需要匹配30位,．26. Refer to the exhibit. The networks connected to router R2 have been summarized as a (Choose two.) A. B. C. D. E. F. Answer: BE解釋一下：這個(gè)題其實(shí)就是考察的匯總的問(wèn)題，哪兩個(gè)包文的目的地R1仍將轉(zhuǎn)發(fā)給R2。21. A pany is installing IP phones. The phones and office puters connect to the same device. To ensure maximum throughput for the phone data, the pany needs to make sure that the phone traffic is on a different network from that of the office puter data traffic. What is the best network device to which to directly connect the phones and puters, and what technology should be implemented on this device? (Choose two.) A. hub B. router C. switch D. STP E. subinterfaces F. VLAN Answer: CF解釋一下：公司的語(yǔ)音設(shè)備和辦公的設(shè)備都連在相同的設(shè)備上，還要確保語(yǔ)音的數(shù)據(jù)流在不同與公司的辦公的數(shù)據(jù)流量，最好的網(wǎng)絡(luò)設(shè)備當(dāng)然是交換機(jī)了，然后利用VLAN的技術(shù)就完全可以滿足所有的要求了。16. Refer to the exhibit. Assume that all router interfaces are operational and correctly configured. In addition, assume that OSPF has been correctly configured on router R2. How will the default route configured on R1 affect the operation of R2? A. Any packet destined for a network that is not directly connected to router R1 will be dropped. B. Any packet destined for a network that is