📄 模拟考试3.htm
字号:
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>
如果沿着帧传送方向出现了拥塞，则把帧地址字段中的， (63) 位设置为1©) <BR>答： <INPUT class=radio
name=text1603 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.BECN<BR> <INPUT class=radio name=text1603
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.FECN<BR> <INPUT class=radio name=text1603
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.DECN<BR> <INPUT class=radio name=text1603
onblur="this.className='radio'"
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>30 </TD>
<TD align=left height=212 width=607> 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)__。©) <BR>答： <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> <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> <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> <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> 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)__。©) <BR>答： <INPUT
class=radio name=text1651 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.3Kbps<BR> <INPUT class=radio name=text1651
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.6Kbps<BR> <INPUT class=radio name=text1651
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.56Kbps<BR> <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>32 </TD>
<TD align=left height=212 width=607> 根据奈奎斯特第一定理，为了保证传输质量，为达到
3KbpS 的数据传输车需要的带宽为___(9)___。©) <BR>答： <INPUT class=radio
name=text1657 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.3KHz<BR> <INPUT class=radio name=text1657
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.6KHz<BR> <INPUT class=radio name=text1657
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.2KHz<BR> <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>33 </TD>
<TD align=left height=212 width=607> 与线路交换相比，最大的缺点是__(12)__©)
<BR>答： <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> <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> <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> <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>34 </TD>
<TD align=left height=212 width=607>
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)__。©)
<BR>答： <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> <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> <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> <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>35 </TD>
<TD align=left height=212 width=607> 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)__。 ©)
<BR>
<CENTER><IMG border=0 src="模拟考试3.files/200481394349wso3x8.gif">
</CENTER><BR>答： <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> <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> <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> <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>36 </TD>
<TD align=left height=212 width=607> 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)__©) <BR>答： <INPUT class=radio
name=text1688 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.应用层<BR> <INPUT class=radio name=text1688
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.传输层<BR> <INPUT class=radio name=text1688
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio value=C>C.
IP层<BR> <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>37 </TD>
<TD align=left height=212 width=607> 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©) <BR>答： <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> <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> <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> <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>38 </TD>
<TD align=left height=212 width=607> 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©) <BR>答： <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> <INPUT class=radio name=text1694
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.Kerberos 鉴别<BR> <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> <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>39 </TD>
<TD align=left height=212 width=607> TCP
是一个面向连接的协议，它提供连接的功能是__(31)__的©) <BR>答： <INPUT class=radio
name=text1703 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio value=A>A.
全双工<BR> <INPUT class=radio name=text1703
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.半双工<BR> <INPUT class=radio name=text1703
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.单工<BR> <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>40 </TD>
<TD align=left height=212 width=607> 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。©) <BR>答： <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> <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> <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> <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> 当计算机需要通过相连的 MORDEM
发送数据时，依次设置的信号是__(50)__。©) <BR>答： <INPUT class=radio name=text1957
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.MODEM就绪→
DTE就绪→请求发送→允许发送→发数据→清请求发送→清允许发送→清MODEM就绪→清DTE就绪<BR>
<INPUT class=radio name=text1957 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.MODEM就绪→DTE就绪→请求发送→允许发送→发数据→清请求发送→清允许发送→清DTE就绪→清MODEM就绪<BR>
<INPUT class=radio name=text1957
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
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