老大，有问题请教！
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。<br><br>10.At which OSI layer is the best path to a network determined? B 正确答案：B、C<br> A. Data Link <br> B. Network <br> C. Physical <br> D. Presentation <br> E. Session <br> F. Transport<br> 注:physical 也可以吗？<br><br>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<br> A. Passive route <br> B. Default routes <br> C. Passive interface <br> D. Route update filtering <br> 注： route update filtering是什么意思，怎么用？<br><br>26.What are four function/characteristics of the network layer of the OSI model? (Choose four) abcg正确答案：ABCD<br> A. It uses a two-part address. <br> B. It maintains routing tables. <br> C. It uses broadcast addresses. <br> D. It establishes network addresses. <br> E. It provides access to the LAN media. <br> F. It provides media independence for upper layers. <br> G. It provides path selection for internetwork communication.<br> 注：g错了吗？<br><br>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<br> A. MAC address of the destination host Ethernet port <br> B. MAC address of the local router Ethernet port <br> C. MAC address of the destination router Serial port <br> D. MAC address of the local router Serial port<br> 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。<br><br>40.Which of the following are not true of standard half-duplex Ethernet circuitry? <br> 我的答案：d正确答案：A<br> A. It is alternate one-way communication. <br> B. The receive (RX) is wired directly to the transmit (TX) of the remote station. <br> C. The receive (TX) is wired directly to the receive (RX) of the remote station. <br> D. Collisions are not possible. <br> E. Both stations can transmit simultaneously.<br> 注：d为什么是对的，半双工以太网中不会出现冲突？<br><br>48.Which three statements about common elements of the TCP/IP protocol stack are true? (Choose three) bcd正确答案：ACE<br> A. IP provides connection less service and routing capabilities. <br> B. ARP enables devices to locate the IP address of local devices. <br> C. UDP provides simple connection less service without windowing or acknowledgements. <br> D. ICMP provides connection oriented management data to routers and layer three switches. <br> E. TCP enables devices to send large quantities of data using switching in a connection-oriented manner.<br><br><br><br><br><br><br><br>［此帖子已被 大风 在 2003-10-13 10:46:02 编辑过］ chinamoon:<br>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.<br><br><br><BLOCKQUOTE><strong>引用</strong>：<HR Size=1>原文由 <b>大风</b> 发表:<br><br>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。<br><br>10.At which OSI layer is the best path to a network determined? B 正确答案：B、C<br> A. Data Link <br> B. Network <br> C. Physical <br> D. Presentation <br> E. Session <br> F. Transport<br> 注:physical 也可以吗？<br><br>B正确.BC错误. <br><br>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<br> A. Passive route <br> B. Default routes <br> C. Passive interface <br> D. Route update filtering <br> 注： route update filtering是什么意思，怎么用？<br>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.<br><br>26.What are four function/characteristics of the network layer of the OSI model? (Choose four) abcg正确答案：ABCD<br> A. It uses a two-part address. <br> B. It maintains routing tables. <br> C. It uses broadcast addresses. <br> D. It establishes network addresses. <br> E. It provides access to the LAN media. <br> F. It provides media independence for upper layers. <br> G. It provides path selection for internetwork communication.<br> 注：g错了吗？<br><br>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<br> A. MAC address of the destination host Ethernet port <br> B. MAC address of the local router Ethernet port <br> C. MAC address of the destination router Serial port <br> D. MAC address of the local router Serial port<br> 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。<br><br>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.<br><br>40.Which of the following are not true of standard half-duplex Ethernet circuitry? <br> 我的答案：d正确答案：A<br> A. It is alternate one-way communication. <br> B. The receive (RX) is wired directly to the transmit (TX) of the remote station. <br> C. The receive (TX) is wired directly to the receive (RX) of the remote station. <br> D. Collisions are not possible. <br> E. Both stations can transmit simultaneously.<br> 注：d为什么是对的，半双工以太网中不会出现冲突？<br>答案D.你是正确的.答案没改.<br><br>48.Which three statements about common elements of the TCP/IP protocol stack are true? (Choose three) bcd正确答案：ACE<br> A. IP provides connection less service and routing capabilities. <br> B. ARP enables devices to locate the IP address of local devices. <br> C. UDP provides simple connection less service without windowing or acknowledgements. <br> D. ICMP provides connection oriented management data to routers and layer three switches. <br> E. TCP enables devices to send large quantities of data using switching in a connection-oriented manner.<br>答案:BCD<br>你是正确的.原答案没改.<br><br><br><br><br><br><br>［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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