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      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=C>C.LAP-D<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1601 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=D>D.LAP-F<BR></TD></TR>
  <TR class=trh1>
    <TD align=middle height=212 width=29>29 </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>30 </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>31 </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>32 </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>33 </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>34 </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>35 </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>36 </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>37 </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8.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>38 </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,在物理层可以采用__(26)__加强通信线路的安全&copy;) <BR>答: &nbsp;<INPUT 
      class=radio name=text1690 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=A>A.防窃听技<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1690 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=B>B.防火墙技术<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1690 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=C>C.防病毒技术<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1690 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=D>D.防拒认技术 <BR></TD></TR>
  <TR class=trh1>
    <TD align=middle height=212 width=29>39 </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,在传输层主要解决进程到进程间的加密,最常见的传输层安全技术有__(29)__&copy;) <BR>答: 
      &nbsp;<INPUT class=radio name=text1699 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=A>A.SET<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1699 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=B>B.IPsec<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1699 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=C>C.S-HTTP<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1699 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=D>D.SSL <BR></TD></TR>
  <TR class=trh1>
    <TD align=middle height=212 width=29>40 </TD>
    <TD align=left height=212 width=607>&nbsp; &nbsp; TCP 
      是一个面向连接的协议,采用__(32)___技术来实现可靠数据流的传送。&copy;) <BR>答: &nbsp;<INPUT class=radio 
      name=text1706 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=A>A.超时重传<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1706 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=B>B.肯定确认(捎带一个分组的序号)<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio 
      name=text1706 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=C>C.超时重传和肯定确认(捎带一个分组的序号)<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio 
      name=text1706 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=D>D.丢失重传和重复确认<BR></TD></TR>
  <TR class=trh1>
    <TD align=middle height=212 width=29>41 </TD>
    <TD align=left height=212 width=607>&nbsp; &nbsp; TCP 

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