网络设计过程包括逻辑网络设计和物理网络设计两个阶段，各个阶段都要产生相应的文档，以下选项中，（69）属于逻辑网络设计文档，（70）属于物理网络设计文档。

试卷相关题目

• 1大型局域网通常组织成分层结构（核心层.汇聚层和接入层），以下关于网络核心层的叙述中，正确的是（68）  。

  A.为了保障安全性，应该以分组进行尽可能多的处理

  B.将数据分组从一个区域高速地转发到另一个区域

  C.由多台二.三层交换机组成

  D.提供用户的访问控制

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• 2无线局域网（WLAN）标准IEEE802.llg规定的最大数据速率是（67） 。

  A.1Mb/s

  B.11 Mb/s

  C.5 Mb/s

  D.54Mb/s

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• 3IEEE802.11采用了类似于802.3 CSMA/CD协议，之所以不采用CSMA/CD协议的原因是（66） 。

  A.CSMA/CD协议的效率更高

  B.为了解决隐蔽终端问题

  C.CSMA/CD协议的开销更大

  D.为了引进其他业务

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• 4以下属于万兆以太网物理层标准的是（65） 。

  A.IEEE802.3u

  B.IEEE802.3a

  C.IEEE802.3e

  D.IEEE802.3ae

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• 5采用CSMA/CD协议的基带总线，其段长为1000m，中间没有中继器，数据速率为10Mb/s，信号传播速度为200m/μs，为了保证在发送期间能够检测到冲突，则该网络上的最小帧长应为（64）比特。

  A.50

  B.100

  C.150

  D.200

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• 6A transport layer protocol usually has several responsibilities .One is to create a process-to-process communication;UDP uses (71)numbers to accomplish this.Another Responsibility is to provide control mechanisms at the  transpt level.UDP does this task at a very minimal level.There is no flow control mechanism and there Is no(72) for received packet. UDP,however ,does provide error control to some extent.If UDP detects an error in the received packet,it will silently drop it.The transport layer also provides a connection mechanism for the processes.The(73)must be able to send streams of data to the transport layer.It is the responsibility of the transport layer at (74)station to make the connection with the receiver.chop the stream into transportable units,number them,and send them one by one.It is the responsibility of th transorort layer at the receiving end to wait until all the different units  belong to th same process have arrived,check and pass those that are(75) free ,and deliver them to the receiving process as a stream.

  A.hop

  B.port

  C.route

  D.packet

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