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      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=C>C.2KHz<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1657 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=D>D.56KHz<BR></TD></TR>
  <TR class=trh1>
    <TD align=middle height=212 width=29>29 </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>30 </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>31 </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>32 </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6.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>33 </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,提供主机 A 和主机 B 应用层之间通信的层是__(21)__&copy;) <BR>答: &nbsp;<INPUT 
      class=radio name=text1684 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=text1684 
      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=text1684 
      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=text1684 
      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>34 </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>35 </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 
      value=A>A.公钥基础<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1694 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=B>B.Kerberos 鉴别<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio 
      name=text1694 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=C>C.通信保密机 <BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1694 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio value=D>D.CA 
      认证中心<BR></TD></TR>
  <TR class=trh1>
    <TD align=middle height=212 width=29>36 </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,为了将低层安全服务进行抽象和屏蔽,最有效的一类做法是可以在传输层和应用层之间建立中间件层次实现通用的安全服务功能,通过定义统一的安全服务接口向应用层提供__(30)__安全服务。&copy;) 
      <BR>答: &nbsp;<INPUT class=radio name=text1701 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=A>A.身份认证<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1701 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=B>B.访问控制 <BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1701 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=C>C.身份认证、访问控制和数据加密<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio 
      name=text1701 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=D>D.数据加密<BR></TD></TR>
  <TR class=trh1>
    <TD align=middle height=212 width=29>37 </TD>
    <TD align=left height=212 width=607>&nbsp; &nbsp; TCP 
      是一个面向连接的协议,它提供连接的功能是__(31)__的&copy;) <BR>答: &nbsp;<INPUT class=radio 
      name=text1703 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio value=A>A. 
      全双工<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1703 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=B>B.半双工<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1703 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=C>C.单工<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1703 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=D>D.单方向<BR></TD></TR>
  <TR class=trh1>
    <TD align=middle height=212 width=29>38 </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>39 </TD>
    <TD align=left height=212 width=607>&nbsp; &nbsp; TCP 
      是一个面向连接的协议,为了提高效率,又引入了滑动窗口协议,协议规定重传__(33)__的分组&copy;) <BR>答: &nbsp;<INPUT 
      class=radio name=text1708 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=A>A.未被确认及至窗口首端的所有分<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio 
      name=text1708 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=B>B.未被确认<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1708 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=C>C.未被确认及至退回N值的所有分组<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio 
      name=text1708 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=D>D.仅丢失的<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 ISO OSI/RM 
      基础上的公共管理信息服务/公共管理信息协议 CMIS/CMIP 是一个完整的网络管理协议族,网络管理应用进程使用 OSI 
      参考模型的__(39)__。&copy;) <BR>答: &nbsp;<INPUT class=radio name=text1717 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=A>A.网络层<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1717 
      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=text1717 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=C>C.已表示层<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1717 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=D>D.应用层<BR></TD></TR>
  <TR class=trh1>
    <TD align=middle height=212 width=29>41 </TD>
    <TD align=left height=212 width=607>&nbsp; &nbsp; CMOT 
      是要在__(40)__上实现公共管理信息服务协议(CMIS)的服务,它是一个过渡性的解决方案,希望过渡到 OSI 网络管理协议被广泛采用。 &copy;) 
      <BR>答: &nbsp;<INPUT class=radio name=text1719 

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