思科認證主要考試內容是什麼?今天yjbys小編爲大家分享的是思科認證考試模擬試題及答案，僅供同學們複習參考!
1. Before inserting a new switch in the network, the network administrator checks that the VTP domain name is correct, the VTP mode is set to server, and revision is lower than the switches in the network. The administrator then configures interfaces and trunks, erases existing VLANs, and connects the switch to the network. Following that procedure, there is no connectivity in the network. What is a possible cause of this problem?
之前在網絡中加入了一個新的交換機，網絡管理員檢查VTP域名是正確的。VTP模式設置爲 服務器，修訂號也比其他的交換機低。管理員配置接口和Trunk。清空了所有的VLAN後吧 交換機連接入網絡。經過這些操作，交換機沒有任何的網絡連接。這是什麼問題?
A. Because the configuration revision of the new switches is lower than the rest of the network, it can change the VLAN database of the other switches. B. As a VTP server, the new switch deleted all VLANs of the network. C. Erasing VLANs increases the VTP configuration revision.
清空VLAN 會影響到VTP的修訂號
D. Since the configuration revision of the network is higher than the new switch, the VLAN database was automatically synchronized.
Answer: C
2. While deploying a new switch, you accidently connect ports 3/12 and 3/18 together, creating a loop. STP detected it and placed port 3/18 in blocking mode. Why did STP not place port 3/12 in blocking mode instead?
當部署一個新的交換機，你無意的鏈接了3/12/和3/18，形成了一個環路，STP把3/18端口 設置爲阻斷端口，爲什麼沒有把3/12設置爲阻斷端口呢?
A. Port 3/12 was already up and forwarding before the loop was created. B. Port priority is based on lowest priority and lowest port number. 因爲端口ID 3/12比較低 C. You connected the wire on port 3/18 last. D. None of the above, it is purely random. Answer: B
3. Two routers configured to run BGP have been connected to a firewall, one on the inside interface and one on the outside interface. BGP has been configured so the two routers should peer, including the correct BGP session endpoint addresses and the correct BGP session hop-count limit (EBGP multihop). What is a good first test to see if BGP will work across the firewall?
有兩個運行BGP的路由器連接到防火牆， 一個在inside接口， 一個在outside 接口。 BGP 已經配置並且已經成爲了鄰居，包含正確的配置了BGP網絡地址和正確的BGP跳數的限制 (EBGP的多跳設置)，怎麼能夠最好的測試BGP工作在防火牆上。
A. Attempt to TELNET from the router connected to the inside of the firewall to the router connected to the outside of the firewall. If telnet works, BGP will work, since telnet and BGP
both use TCP to transport data.
用在inside接口上的路由器telnet 到在outside 接口上的路由器。如果telnet 正常工作側說明 BGP能正常工作，因爲telnet 和BGP 都是使用TCP 來傳輸數據的
B. Ping from the router connected to the inside interface of the firewall to the router connected to the outside interface of the firewall. If you can ping between them, BGP should work, since BGP uses IP to transport packets. C. There is no way to make BGP work across a firewall without special configuration, so there is no simple test that will show you if BGP will work or not, other than trying to start the peering session. D. There is no way to make BGP work across a firewall.
Answer: A
4. Refer to the exhibit. In this network, R1 has been configured to advertise a summary route, , to R2. R2 has been configured to advertise a summary route, , to R1. Both routers have been configured to remove the discard route (the route to null created when a summary route is configured) by setting the administrative distance of the discard route to 255.
如圖所示，在這個網絡中，R1通告了的'彙總路由給R2， R2通告了的彙總路由給R1。兩臺路由器都配置了彙總路 由的null0 接口來防止路由的環路。發生什麼情況，R1能收到一個去192.16 8.3.1的數據包?
What will happen if R1 receives a packet destined to ? A. The packet will loop between R1 and R2. 這個包在R1和R2之間形成了環路 B. It is not possible to set the administrative distance on a summary to 255. C. The packet will be forwarded to R2, where it will be routed to null0. D. The packet will be dropped by R1, since there is no route to .
Answer: A
5. Refer to the exhibit. In this network, R1 is configured not to perform autosummarization within EIGRP. What routes will R3 learn from R2 through EIGRP?
如圖所示，在這個網絡中 R1配置爲在EIGRP中不做自動彙總，那麼R3能從R2學到什麼 EIGRP的路由信息。
A. and ; EIGRP only performs autosummarization at the edge
between two major
和 EIGRP在兩個較大的網絡邊緣只能執行自動彙總。
B. and ; R2 will perform autosummarization, although R1 will not. C. Since R2 is configured without autosummarization, it will not propagate the route. D. and Answer: A
