[讨论]关于NA中几道题目的疑问，麻烦解答一下
1.Julia telnets to a pc on a remote subnet,which MAC address will be present in the ARP table when you issue the show arp command?<br><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><br> 为什么是选A，，我认为答案错了，曾做过类似的一道，，虽然其中是将network改为subnet，但我认为是一样的，，应该选B<br><br>2.Which of the following are not true of standard half-duplex Ethernet circuitry?<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>我认为题目错了，，应该问TRUE而不是NOT TRUE！怎么可能答案只有D呢，E不也是错了吗？<br>还有，请胡大解释一下B和C，什么是RX和TX<br>3. Which of the following statements about a reliable connection oriented data transfer are true? (Choose two)<br>A. Recipients acknowledge receipt of data.<br>B. When buffers are filled to capacity, datagrams are discarded and not re transmitted.<br>C. Windows are used to control the amount in outstanding acknowledged data segments.<br>D. If the segments timer expires between receipt of an acknowledgement the sender drops the connection.<br>E. The receiving device waits for acknowledgements from the sending device before accepting more data segments.这题飞猴也曾经贴过，这题A为什么不对？我认为E不对，应该是sending device waits for acknowledgement from the receiving device<br><br>4.Using a protocol analyzer we noticed sustained,heavy collisons in our CSMA/CD LANs What are some possible affects could t his have our LAN?(Choose three.)<br>A.Incresed broadcast traffic<br>B.Delay<br>C.Low throughput<br>D.High throughput<br>E.Congestion<br>F.Higher bandwidth<br>答案是BCE，，，为什么A错了，，B对了？<br><br>5.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？ Rx:网卡接收端<br>Tx:网卡发送端<br>去找个网卡功能示意图,一看便知 1.第一题本来就是B。<br>2.BC都是全双工的内容。DE都错。这题题目应该是TRUE，选A<br>3.这题我不理解。<br>4.这题开始我也不理解。实际上是问，严重的碰撞对网络有什么影响；很明显是延迟、低吞吐量和阻塞。<br>5.正确答案是ABCG。 猴子对第四题的解释不错，thanks 第一题选B<br>第三题经与阿米巴讨论后选AC<br>第五题ABCG，可以参加今天给的Study Guide.<br><br>
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