2008年11月网络工程师试题+答案+解析 绝对好用(10)

2008年11月网络工程师试题+答案+解析 是本人的心血之作,绝对清晰,绝对好用!!!

● The usual way to ensure reliable delivery is to provide the （71） with some feedback

about what is happening at the other end of the line. Typically, the protocol calls for the receiver to send back special （72） frame bearing positive or negative （73） about the incoming frames. If the sender receives a positive acknowledgement about a frame, it knows the frame has arrived safely. On the other hand, a negative acknowledgement means that something has gone wrong, and the frame must be transmitted again.

An additional complication comes from the possibility that hardware troubles may cause a

frame to （74） completely. In this case, the receiver will not react at all, since it has no any reason to react. It should be clear that a protocol in which the sender transmits a frame and then waits for an acknowledgement, positive or negative, will hang forever if a frame is ever lost due to, for example, （75） hardware.

（71）A. receiver B. controller C. sender D. customer

（72）A. data B. control C. request D. session

（73）A. application B. connection C. stream D. acknowledgement

（74）A. vanish B. vary C. appear D. incline

（75）A. acting B. working C. malfunctioning D. functioning

试题一（15 分）

阅读以下说明，回答问题1至问题3，将解答填入答题纸对应的解答栏内。

【说明】

某校园网申请到了C类网络地址块202.115.0.0/24~202.115.3.0/24。根据网络规划需求，网络中心、图书馆、教学实验楼以及行政办公楼的各个部门需划分到不同网段。其中Web服务器IP 地址为202.115.0.10，网络拓扑结构如图1-1所示。

图 1-1