老大，有问题请教！

大风 · 发表于 2003-10-12 16:19:27

昨晚刚刚做完第二次测试，收到答案后，有几道题还有点疑问，请教一下。 10.At which OSI layer is the best path to a network determined? B 正确答案：B、C A. Data Link B. Network C. Physical D. Presentation E. Session F. Transport 注:physical 也可以吗？ 14.IP RIP routing is configured on a router, but all interfaces attach to RIP network. What should you use to prevent all RIP routing updates from being sent through selected interfaces without using access lists? C 正确答案：CD A. Passive route B. Default routes C. Passive interface D. Route update filtering 注： route update filtering 是什么意思，怎么用？ 26.What are four function/characteristics of the network layer of the OSI model? (Choose four) abcg 正确答案：ABCD A. It uses a two-part address. B. It maintains routing tables. C. It uses broadcast addresses. D. It establishes network addresses. E. It provides access to the LAN media. F. It provides media independence for upper layers. G. It provides path selection for internetwork communication. 注：g错了吗？ 32. You telnet to a host on a remote network. Which MAC address will be present in the ARP table when you issue the show arp command? d 正确答案：B A. MAC address of the destination host Ethernet port B. MAC address of the local router Ethernet port C. MAC address of the destination router Serial port D. MAC address of the local router Serial port 注：这道题我有点疑问，我当时想我如果是用console 连接到路由器再telnet to a host on a remote network，没有经过Ethernet port，ARP table还会有MAC address of the local router Ethernet port吗？也不知道Serial port有没有MAC地址，考虑到Serial port应该都是要过的，就选了一个d。 40.Which of the following are not true of standard half-duplex Ethernet circuitry? 我的答案：d 正确答案：A A. It is alternate one-way communication. B. The receive (RX) is wired directly to the transmit (TX) of the remote station. C. The receive (TX) is wired directly to the receive (RX) of the remote station. D. Collisions are not possible. E. Both stations can transmit simultaneously. 注：d为什么是对的，半双工以太网中不会出现冲突？ 48.Which three statements about common elements of the TCP/IP protocol stack are true? (Choose three) bcd 正确答案：ACE A. IP provides connection less service and routing capabilities. B. ARP enables devices to locate the IP address of local devices. C. UDP provides simple connection less service without windowing or acknowledgements. D. ICMP provides connection oriented management data to routers and layer three switches. E. TCP enables devices to send large quantities of data using switching in a connection-oriented manner. ［此帖子已被大风在 2003-10-13 10:46:02 编辑过］

chinamoon · 发表于 2003-10-13 22:00:20

chinamoon: 不好意思,这份答案由于部分题目我改过了.而给办公室的答案还没改,所以,有部分答案是错误的. <BLOCKQUOTE>引用：<HR Size=1>原文由 大风 发表: 昨晚刚刚做完第二次测试，收到答案后，有几道题还有点疑问，请教一下。 10.At which OSI layer is the best path to a network determined? B 正确答案：B、C A. Data Link B. Network C. Physical D. Presentation E. Session F. Transport 注:physical 也可以吗？ B正确.BC错误. 14.IP RIP routing is configured on a router, but all interfaces attach to RIP network. What should you use to prevent all RIP routing updates from being sent through selected interfaces without using access lists? C 正确答案：CD A. Passive route B. Default routes C. Passive interface D. Route update filtering 注： route update filtering 是什么意思，怎么用？ 路由更新过滤,就是使用access-list表来过滤某些路由的收,发.由于题目是要求除了使用access list外的方法,所以,正确答案只有C,你是正确的. 26.What are four function/characteristics of the network layer of the OSI model? (Choose four) abcg 正确答案：ABCD A. It uses a two-part address. B. It maintains routing tables. C. It uses broadcast addresses. D. It establishes network addresses. E. It provides access to the LAN media. F. It provides media independence for upper layers. G. It provides path selection for internetwork communication. 注：g错了吗？ 32. You telnet to a host on a remote network. Which MAC address will be present in the ARP table when you issue the show arp command? d 正确答案：B A. MAC address of the destination host Ethernet port B. MAC address of the local router Ethernet port C. MAC address of the destination router Serial port D. MAC address of the local router Serial port 注：这道题我有点疑问，我当时想我如果是用console 连接到路由器再telnet to a host on a remote network，没有经过Ethernet port，ARP table还会有MAC address of the local router Ethernet port吗？也不知道Serial port有没有MAC地址，考虑到Serial port应该都是要过的，就选了一个d。 这道题你可以考虑下次做做实验就知道是否正确.另外,you telnet没有说你的那种假定情况,注意不要以偏盖全. 40.Which of the following are not true of standard half-duplex Ethernet circuitry? 我的答案：d 正确答案：A A. It is alternate one-way communication. B. The receive (RX) is wired directly to the transmit (TX) of the remote station. C. The receive (TX) is wired directly to the receive (RX) of the remote station. D. Collisions are not possible. E. Both stations can transmit simultaneously. 注：d为什么是对的，半双工以太网中不会出现冲突？ 答案D.你是正确的.答案没改. 48.Which three statements about common elements of the TCP/IP protocol stack are true? (Choose three) bcd 正确答案：ACE A. IP provides connection less service and routing capabilities. B. ARP enables devices to locate the IP address of local devices. C. UDP provides simple connection less service without windowing or acknowledgements. D. ICMP provides connection oriented management data to routers and layer three switches. E. TCP enables devices to send large quantities of data using switching in a connection-oriented manner. 答案:BCD 你是正确的.原答案没改. ［此帖子已被大风在 2003-10-13 10:46:02 编辑过］<HR SIZE=1></BLOCKQUOTE>

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[讨论/求助] 老大，有问题请教！