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📁 网络工程师试题对你一定会用帮助
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      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>29 </TD>
    <TD align=left height=212 width=607>&nbsp; &nbsp; 在一个带宽为 
      3KHZ、没有噪声的信道,传输二进制信号时能够达到的极限数据传输率为__(6)__。&copy;) <BR>答: &nbsp;<INPUT 
      class=radio name=text1651 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=A>A.3Kbps<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1651 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=B>B.6Kbps<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1651 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=C>C.56Kbps<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1651 
      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>30 </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>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,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>32 </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>33 </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4.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>34 </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4.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>35 </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>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,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>37 </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,在网络层可以采用__(28)__来处理信息内外网络边界流动和建立透明的安全加密信道&copy;) <BR>答: 
      &nbsp;<INPUT class=radio name=text1697 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=text1697 
      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=text1697 
      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=text1697 
      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>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>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,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>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 

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