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      onfocus="this.className='inputedit';this.select()" type=radio 
      value=D>D.TECN<BR></TD></TR>
  <TR class=trh1>
    <TD align=middle height=212 width=29>29 </TD>
    <TD align=left height=212 width=607>&nbsp; &nbsp; IEEE802.5令牌环(Tokenm 
      Ring)网中,时延是由__(1)__决定。&copy;) <BR>答: &nbsp;<INPUT class=radio name=text1643 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=A>A.站点时延和信号传话时延<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio 
      name=text1643 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=B>B.令牌帧长短和数据帧长短<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio 
      name=text1643 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=C>C.电缆长度和站点个数<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio 
      name=text1643 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=D>D.数据传输单和信号传播速度<BR></TD></TR>
  <TR class=trh1>
    <TD align=middle height=212 width=29>30 </TD>
    <TD align=left height=212 width=607>&nbsp; &nbsp; IEEE802.5令牌环(Tokenm 
      Ring)网中,要保证环网的正常运行,环的时延必须有一个最低限度,即__(2)__。&copy;) <BR>答: &nbsp;<INPUT 
      class=radio name=text1644 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=A>A.数据帧长<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1644 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=B>B.令牌帧长<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1644 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=C>C.信号传播时延<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1644 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=D>D.站点个数<BR></TD></TR>
  <TR class=trh1>
    <TD align=middle height=212 width=29>31 </TD>
    <TD align=left height=212 width=607>&nbsp; &nbsp; 设有某一个令牌环网长度为 400 米,环上有 
      28 个站点,其数据传输率为 4MbpS,环上信号的传播速度为 200 米/μS,每个站点具有 1bit 
      时延,当始终有一半站点打开工作时,要保证环网的正常运行,至少还要将电缆的长度增加__(5)__米。&copy;) <BR>答: &nbsp;<INPUT 
      class=radio name=text1649 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=A>A.50<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1649 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=B>B.100<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1649 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=C>C.200<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1649 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=D>D.400<BR></TD></TR>
  <TR class=trh1>
    <TD align=middle height=212 width=29>32 </TD>
    <TD align=left height=212 width=607>&nbsp; &nbsp; 一个带宽为 3KHZ、信噪比为 30dB 
      的信道,能够达到的极限数据传输率为__(7)__。&copy;) <BR>答: &nbsp;<INPUT class=radio name=text1653 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=A>A.12Kbps<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1653 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=B>B.30Kbps<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1653 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=C>C.56Kbps<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1653 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=D>D.10Mbps<BR></TD></TR>
  <TR class=trh1>
    <TD align=middle height=212 width=29>33 </TD>
    <TD align=left height=212 width=607>&nbsp; &nbsp; 
      在一个无限带宽的无噪声信道上,传输二进制信号,当信号的带宽为 3KHz 时,能达到的极限数据传输率为__(10)__Kbps 。&copy;) <BR>答: 
      &nbsp;<INPUT class=radio name=text1659 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=A>A.1.5<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1659 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=B>B.3<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1659 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=C>C.6<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1659 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio value=D>D.3 
      log23<BR></TD></TR>
  <TR class=trh1>
    <TD align=middle height=212 width=29>34 </TD>
    <TD align=left height=212 width=607>&nbsp; &nbsp; 
      与线路交换相比,分组交换最大的优点是__(11)__&copy;) <BR>答: &nbsp;<INPUT class=radio name=text1661 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=A>A.延迟时间小<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1661 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=B>B.可进行差错控制<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1661 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=C>C.缓冲区易于管理<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1661 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=D>D.便于标准化<BR></TD></TR>
  <TR class=trh1>
    <TD align=middle height=212 width=29>35 </TD>
    <TD align=left height=212 width=607>&nbsp; &nbsp; 与线路交换相比,最大的缺点是__(12)__&copy;) 
      <BR>答: &nbsp;<INPUT class=radio name=text1663 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=A>A.增大延迟<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1663 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=B>B.不能实现链路共享<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio 
      name=text1663 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=C>C.不能实现速率转换<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio 
      name=text1663 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=D>D.不能满足实时应用要求<BR></TD></TR>
  <TR class=trh1>
    <TD align=middle height=212 width=29>36 </TD>
    <TD align=left height=212 width=607>&nbsp; &nbsp; 与线路交换相比,设待传送数据总长度为 L 
      位分组长度为 P 位,其中头部开销长度为 H 位,源节点到目 的节点之间的链路数为 h,每个键路上的延迟时间为 D 秒,数据传输率为 B 
      bps,线路交换和虚电路建立连接的时间都为 S 秒,在分组交换方式下每个中间节点产生 d 
      位的延迟时间,则传送所有数据,线路交换需时间为__(13)__秒&copy;) <BR>答: &nbsp;<INPUT class=radio 
      name=text1665 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=A>A.hD+L/B<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1665 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=B>B.S+hD+L/P<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio 
      name=text1665 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=C>C.S+hD+L/B<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio 
      name=text1665 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=D>D.S+L/B<BR></TD></TR>
  <TR class=trh1>
    <TD align=middle height=212 width=29>37 </TD>
    <TD align=left height=212 width=607>&nbsp; &nbsp; 
      透明网桥的基本功能有学习、帧过滤和帧转发及生成树算法等功能,因此它可以决定网络中的路由,而网络中的各个站点均不负责路由选择。网桥从其某一端口收到正确的数据帧后,在其地址转发表中查找该帧要到达的目的站,若查找不到,则会__(16)__&copy;) 
      <BR>答: &nbsp;<INPUT class=radio name=text1671 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=A>A.向除该端口以外的桥的所有端口转发此帧<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio 
      name=text1671 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=B>B.向桥的所有端口转发此帧<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio 
      name=text1671 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=C>C.仅向该端口转发此帧<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio 
      name=text1671 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=D>D.不转发此帧,而由桥保存起来<BR></TD></TR>
  <TR class=trh1>
    <TD align=middle height=212 width=29>38 </TD>
    <TD align=left height=212 width=607>&nbsp; &nbsp; 图一为两个局域网 LAN1 和 LAN2 
      通过网桥 1 和网桥 2 互连后形成的网络结构。设站 A 
      发送一个帧,但其目的地址均不在这两个网桥的地址转发表中,为了有效地解决该类问题,可以在每个网桥中引入生成树算法,这样一来__(19)__。 &copy;) 
      <BR>
      <CENTER><IMG border=0 src="模拟考试1.files/200481394349wso3x8.gif"> 
      </CENTER><BR>答: &nbsp;<INPUT class=radio name=text1679 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=A>A.网络资源也会得到充分利用<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio 
      name=text1679 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=B>B.网络的最佳路由也会得到确定<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio 
      name=text1679 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=C>C.也限制了网络规模<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio 
      name=text1679 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=D>D.也增加了网络延时<BR></TD></TR>
  <TR class=trh1>
    <TD align=middle height=212 width=29>39 </TD>
    <TD align=left height=212 width=607>&nbsp; &nbsp; 图二为一 10Mbps 
      数据传输率下的以太网,其上连接有 10 
      个站,在理想状态下每个站的平均数据传输率为1Mbps。若通过网桥连接后成为图三所示的结构时,每个站的实际有效数据传输率为__(20)__Mbps。 
      &copy;) <BR>
      <CENTER><IMG border=0 src="模拟考试1.files/200481394623wso3x9.gif"> 
      </CENTER><BR>答: &nbsp;<INPUT class=radio name=text1682 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio value=A>A.1 
      至 2<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1682 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=B>B.1<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1682 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=C>C.2<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1682 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio value=D>D.0 
      至 1<BR></TD></TR>
  <TR class=trh1>
    <TD align=middle height=212 width=29>40 </TD>
    <TD align=left height=212 width=607>&nbsp; &nbsp; 在使用路由器 R 的 TCP/IP 
      网络中,两主机通过一路由器互联,提供机器之间通信的层是__(22)__&copy;) <BR>答: &nbsp;<INPUT class=radio 
      name=text1688 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=A>A.应用层<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1688 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=B>B.传输层<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1688 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio value=C>C. 
      IP层<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1688 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=D>D.网络接口层<BR></TD></TR>
  <TR class=trh1>
    <TD align=middle height=212 width=29>41 </TD>
    <TD align=left height=212 width=607>&nbsp; &nbsp; 对照 ISO/OSI 
      参考模型各个层中的网络安全服务,在数据链路层,可以采用__(27)__进行链路加密&copy;) <BR>答: &nbsp;<INPUT 
      class=radio name=text1694 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 

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