📄 模拟考试7.htm
字号:
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.HDLC<BR> <INPUT class=radio name=text1601
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.LAP-D<BR> <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>28 </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>29 </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>30 </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>31 </TD>
<TD align=left height=212 width=607>
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 。©) <BR>答：
<INPUT class=radio name=text1659 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.1.5<BR> <INPUT class=radio name=text1659
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.3<BR> <INPUT class=radio name=text1659
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.6<BR> <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>32 </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，若查找不到，则会__(16)__©)
<BR>答： <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> <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> <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> <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>33 </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>34 </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，这样结果会是该帧__(18)__。©) <BR>
<CENTER><IMG border=0 src="模拟考试7.files/200481394246wso3x8.gif">
</CENTER><BR>答： <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> <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> <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> <INPUT class=radio
name=text1675 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio value=D>D.经桥
1 ( 或桥 2 ）到达 LAN2，再经桥 2 ( 或桥 1 ）返回 LAN1 后被站 A 吸收<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>35 </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，提供主机 A 和主机 B 应用层之间通信的层是__(21)__©) <BR>答： <INPUT
class=radio name=text1684 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.应用层<BR> <INPUT class=radio name=text1684
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.传输层<BR> <INPUT class=radio name=text1684
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.IP层<BR> <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>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> 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©) <BR>答：
<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> <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> <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> <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>40 </TD>
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