📄 模拟考试26.htm
字号:
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> 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>30 </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>31 </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>32 </TD>
<TD align=left height=212 width=607> 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。
©) <BR>
<CENTER><IMG border=0 src="模拟考试26.files/200481394623wso3x9.gif">
</CENTER><BR>答： <INPUT class=radio name=text1682
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio value=A>A.1
至 2<BR> <INPUT class=radio name=text1682
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.1<BR> <INPUT class=radio name=text1682
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.2<BR> <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> 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>34 </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，这种分组的数量最多可以__(34)__©) <BR>答： <INPUT
class=radio name=text1710 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.是任意的<BR> <INPUT class=radio name=text1710
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.1个<BR> <INPUT class=radio name=text1710
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.大于滑动窗口的大小<BR> <INPUT class=radio
name=text1710 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.等于滑动窗口的大小<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>35 </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，TCP协议采用滑动窗口协议解决了__(35)__。 ©) <BR>答：
<INPUT class=radio name=text1712 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.端到端的流量控制<BR> <INPUT class=radio
name=text1712 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.整个网络的拥塞控制<BR> <INPUT class=radio
name=text1712 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.端到端的流量控制和网络的拥塞控制<BR> <INPUT class=radio
name=text1712 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.整个网络的差错控制 <BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>36 </TD>
<TD align=left height=212 width=607> N-ISDN
是在__(41)__基础上建立起来的网络©) <BR>答： <INPUT class=radio name=text1721
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.电话网<BR> <INPUT class=radio name=text1721
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.有线电视网<BR> <INPUT class=radio name=text1721
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.公用数据网<BR> <INPUT class=radio name=text1721
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.接入网<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>37 </TD>
<TD align=left height=212 width=607> 当使用 RS232C
连接相关设备时，电缆的长度不应超过__(48)__米。©) <BR>答： <INPUT class=radio
name=text1727 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.3<BR> <INPUT class=radio name=text1727
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.12<BR> <INPUT class=radio name=text1727
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.15<BR> <INPUT class=radio name=text1727
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.50<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>38 </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
value=C>C.DTE就绪→MODEM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=D>D.DTE就绪→MODEM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></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>39 </TD>
<TD align=left height=212 width=607> 信元传输采用__(52)__。©) <BR>答：
<INPUT class=radio name=text1959 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio value=A>A.
TDM<BR> <INPUT class=radio name=text1959
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.FDM<BR> <INPUT class=radio name=text1959
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.WDM<BR> <INPUT class=radio name=text1959
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.ATDM<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>40 </TD>
<TD align=left height=212 width=607> 当进行 VP 交换时，VPI 和 VCI
的变化情况是__(53)__。©) <BR>答： <INPUT class=radio name=text1960
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.VPI变化，VCI不变<BR> <INPUT class=radio
name=text1960 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.VPI不变，VCI变化<BR> <INPUT class=radio
name=text1960 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.VPI变化，VCI变化<BR> <INPUT class=radio
name=text1960 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.VPI不变，VCI不变<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>41 </TD>
<TD align=left height=212 width=607> 指令 ServerAdmin
的作用是__(58)__©) <BR>答： <INPUT class=radio name=text1965
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.设定该WWW服务器的系统管理员账号<BR> <INPUT class=radio
name=text1965 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
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