📄 模拟考试10.htm
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<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> 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大时延是©)
<BR>答： <INPUT class=radio name=text1647
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.9<BR> <INPUT class=radio name=text1647
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.28<BR> <INPUT class=radio name=text1647
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.36<BR> <INPUT class=radio name=text1647
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.48<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>31 </TD>
<TD align=left height=212 width=607> 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，当始终有一半站点打开工作时，要保证环网的正常运行，至少还要将电缆的长度增加__(5)__米。©) <BR>答： <INPUT
class=radio name=text1649 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.50<BR> <INPUT class=radio name=text1649
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.100<BR> <INPUT class=radio name=text1649
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.200<BR> <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>32 </TD>
<TD align=left height=212 width=607> 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)__。©) <BR>答： <INPUT class=radio name=text1653
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.12Kbps<BR> <INPUT class=radio name=text1653
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.30Kbps<BR> <INPUT class=radio name=text1653
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.56Kbps<BR> <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>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> 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，数据报分组交换所需时间为__(15)__秒。©) <BR>答： <INPUT class=radio
name=text1669 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio value=A>A.
(hd/B+P/B)*[L/(P-H)]<BR> <INPUT class=radio
name=text1669 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.(hD＋P/B)*[L/(P-H)] <BR> <INPUT class=radio
name=text1669 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.[(h-1)d/B+hD+P/B]*[L/(P-H)]<BR> <INPUT
class=radio name=text1669 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio value=D>D.
[(h-1)d/B+hD+P/B]*[L/P]<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10.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> 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>38 </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>39 </TD>
<TD align=left height=212 width=607> 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©) <BR>答： <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> <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> <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> <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>
N-ISDN一路话音占用的数据传输率是__(44)__©) <BR>答： <INPUT class=radio
name=text1726 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.3KHz<BR> <INPUT class=radio name=text1726
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.3.4KHz<BR> <INPUT class=radio name=text1726
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.64Kbps<BR> <INPUT class=radio name=text1726
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.128Kbps <BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>41 </TD>
<TD align=left height=212 width=607> 当用 RS232C
直接连接两台计算机时，采用零调制解调器方式，其连接方式为__(49)__。©) <BR>答： <INPUT class=radio
name=text1956 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio value=A>A.用
25 针插座及电缆连接<BR> <INPUT class=radio name=text1956
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio value=B>B.用
9 针插座及电缆连接<BR> <INPUT class=radio name=text1956
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.信号地对接，一台计算机的发送（接收）数据线与对方的接收（发送）数据线相连<BR>
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