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      name=text1596 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=B>B.它的路由表<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1596 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=C>C.与它相邻的路由器的地址<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio 
      name=text1596 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=D>D.所有目标结点的URL<BR></TD></TR>
  <TR class=trh1>
    <TD align=middle height=212 width=29>29 </TD>
    <TD align=left height=212 width=607>&nbsp; &nbsp; 
      在自治系统内部的各个路由器之间,运行的是内部网关协议IGP。当网络规模扩大时,该算法传送的路由信息太多,增加了网络负载,后来又出现了执行最短路径优先算法的IGP。当路由信息改变后,路由器按照 
      (59) 算法更新路由表。&copy;) <BR>答: &nbsp;<INPUT class=radio name=text1598 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=A>A.Diikstra<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio 
      name=text1598 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=B>B.Ford-Fulkerson<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio 
      name=text1598 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=C>C.Floyd<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1598 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=D>D.WarshaH<BR></TD></TR>
  <TR class=trh1>
    <TD align=middle height=212 width=29>30 </TD>
    <TD align=left height=212 width=607>&nbsp; &nbsp; 帧中继网的虚电路建立在 (61) &copy;) 
      <BR>答: &nbsp;<INPUT class=radio name=text1600 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=A>A.数据链路层<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1600 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=B>B.网络层<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1600 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=C>C.传输层<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1600 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=D>D.会话层<BR></TD></TR>
  <TR class=trh1>
    <TD align=middle height=212 width=29>31 </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>32 </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,则环上可能存在的最小时延是&copy;) 
      <BR>答: &nbsp;<INPUT class=radio name=text1645 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=A>A.1<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1645 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=B>B.8<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1645 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=C>C.20<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1645 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=D>D.24<BR></TD></TR>
  <TR class=trh1>
    <TD align=middle height=212 width=29>33 </TD>
    <TD align=left height=212 width=607>&nbsp; &nbsp; 在一个带宽为 
      3KHZ、没有噪声的信道,一个带宽为 3KHZ、信噪比为 30dB 的信道。上述结果表明,__(8)__。&copy;) <BR>答: 
      &nbsp;<INPUT class=radio name=text1655 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=A>A.有噪声信道比无噪声信道具有更大的带宽<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio 
      name=text1655 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=B>B.有噪声信道比无噪声信道可达到更高的极限数据传输率<BR>&nbsp; &nbsp; &nbsp; <INPUT 
      class=radio name=text1655 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=C>C.有噪声信道与无噪声信道没有可比性<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio 
      name=text1655 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=D>D.上述值都为极限值,条件不同,不能进行直接的比较<BR></TD></TR>
  <TR class=trh1>
    <TD align=middle height=212 width=29>34 </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>35 </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>36 </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>37 </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,虚电路分组交换所需时间为__(14)__秒&copy;) <BR>答: &nbsp;<INPUT class=radio 
      name=text1667 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=A>A.S+(hd/B+P/B)*[L/(P-H)]<BR>&nbsp; &nbsp; &nbsp; <INPUT 
      class=radio name=text1667 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=B>B.S+(hD+P/B)*[L/(P-H)]<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio 
      name=text1667 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio value=C>C. 
      S+[(h-1)D+P/B]*[L/(P-H)]<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio 
      name=text1667 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=D>D.S+[(h-1)d/B+hD+P/B]*{L/(P-H)]<BR></TD></TR>
  <TR class=trh1>
    <TD align=middle height=212 width=29>38 </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,数据报分组交换所需时间为__(15)__秒。&copy;) <BR>答: &nbsp;<INPUT class=radio 
      name=text1669 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio value=A>A. 
      (hd/B+P/B)*[L/(P-H)]<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio 
      name=text1669 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=B>B.(hD+P/B)*[L/(P-H)] <BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio 
      name=text1669 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=C>C.[(h-1)d/B+hD+P/B]*[L/(P-H)]<BR>&nbsp; &nbsp; &nbsp; <INPUT 
      class=radio name=text1669 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio value=D>D. 
      [(h-1)d/B+hD+P/B]*[L/P]<BR></TD></TR>
  <TR class=trh1>
    <TD align=middle height=212 width=29>39 </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,若要到达的目的站仍然在该端口上,则会___(17)__。&copy;) 
      <BR>答: &nbsp;<INPUT class=radio name=text1673 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=A>A.向该端口转发此帧<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio 
      name=text1673 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=B>B.丢弃此帧<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1673 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=C>C.将此帧作为地址探测帧<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio 
      name=text1673 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio value=D>D. 
      利用此帧建立该端口的地址转换表<BR></TD></TR>
  <TR class=trh1>
    <TD align=middle height=212 width=29>40 </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,这样结果会是该帧__(18)__。&copy;) <BR>
      <CENTER><IMG border=0 src="模拟考试12.files/200481394246wso3x8.gif"> 
      </CENTER><BR>答: &nbsp;<INPUT class=radio name=text1675 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio value=A>A.经桥 
      1(或桥 2)后被站 B 接收<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1675 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio value=B>B.被桥 
      1(或桥 2 )丢弃<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1675 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=C>C.在整个网络中无限次地循环下去<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio 
      name=text1675 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio value=D>D.经桥 

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