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      value=D>D.MAC地址、端口号和流名称<BR></TD></TR>
  <TR class=trh1>
    <TD align=middle height=212 width=29>16 </TD>
    <TD align=left height=212 width=607>&nbsp; &nbsp; 
      在IPv6中,地址被扩充为128位,并且为IPv4保留了一部分地址空间。按照IPv6的地址表示方法,以下地址中属于IPv4地址的是 (29) 。&copy;) 
      <BR>答: &nbsp;<INPUT class=radio name=text1549 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=A>A.0000:0000:0000:0000:0000:FFFF:1234:1180<BR>&nbsp; &nbsp; &nbsp; 
      <INPUT class=radio name=text1549 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=B>B.0000:0000:0000:1111:111t:FFFF:1234:1180<BR>&nbsp; &nbsp; &nbsp; 
      <INPUT class=radio name=text1549 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=C>C.0000:0000:FFFF:FFFF:FFFF:FFFF:1234:1180<BR>&nbsp; &nbsp; &nbsp; 
      <INPUT class=radio name=text1549 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=D>D.FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:1234:1180<BR></TD></TR>
  <TR class=trh1>
    <TD align=middle height=212 width=29>17 </TD>
    <TD align=left height=212 width=607>&nbsp; &nbsp; 
      A向B发送消息P,并使用公钥体制进行数字签名。Kerberos是MIT为校园网设计的身份认证系统,该系统利用智能卡产生 (33) 
      密钥,可以防止窃听者捕获认证信息。&copy;) <BR>答: &nbsp;<INPUT class=radio name=text1555 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=A>A.私有<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1555 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=B>B.加密<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1555 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=C>C.一次性<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1555 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=D>D.会话<BR></TD></TR>
  <TR class=trh1>
    <TD align=middle height=212 width=29>18 </TD>
    <TD align=left height=212 width=607>&nbsp; &nbsp; 
      A向B发送消息P,并使用公钥体制进行数字签名。另外报文中还加入了 (35) ,用于防止重发攻击(replay attack)。&copy;) <BR>答: 
      &nbsp;<INPUT class=radio name=text1559 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=A>A.伪随机数<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1559 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=B>B.时间标记<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1559 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=C>C.私有密钥<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1559 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=D>D.数字签名<BR></TD></TR>
  <TR class=trh1>
    <TD align=middle height=212 width=29>19 </TD>
    <TD align=left height=212 width=607>&nbsp; &nbsp; 
      IAB制定的网络管理协议是SNMP,在SNMP管理框架中使用的管理信息库为 (38) 。&copy;) <BR>答: &nbsp;<INPUT 
      class=radio name=text1565 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=A>A.MIB—1<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1565 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=B>B.MIB-2<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1565 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=C>C.MIB—3<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1565 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=D>D.MIB-4<BR></TD></TR>
  <TR class=trh1>
    <TD align=middle height=212 width=29>20 </TD>
    <TD align=left height=212 width=607>&nbsp; &nbsp; 
      管理站(Manager)通过GetRequest命令查询代理(Agent)中的管理信息库,如果代理需要向管理站报告一个异常事件,则代理发出 (39) 
      报文。&copy;) <BR>答: &nbsp;<INPUT class=radio name=text1566 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=A>A.Information<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio 
      name=text1566 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=B>B.Exception<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio 
      name=text1566 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=C>C.Trap<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1566 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=D>D.Interrupt<BR></TD></TR>
  <TR class=trh1>
    <TD align=middle height=212 width=29>21 </TD>
    <TD align=left height=212 width=607>&nbsp; &nbsp; 
      管理站(Manager)通过GetRequest命令查询代理(Agent)中的管理信息库,如果代理需要向管理站报告一个异常事件, (40) 
      事件不属于异常事件。&copy;) <BR>答: &nbsp;<INPUT class=radio name=text1567 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=A>A.系统重启动<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1567 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=B>B.链路失效<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1567 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=C>C.报文认证失败<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1567 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=D>D.检索的变量不存在<BR></TD></TR>
  <TR class=trh1>
    <TD align=middle height=212 width=29>22 </TD>
    <TD align=left height=212 width=607>&nbsp; &nbsp; IEEE802.11 
      MAC层具有多种功能,其中分布式协调功能采用的是 (43) 协议&copy;) <BR>答: &nbsp;<INPUT class=radio 
      name=text1574 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=A>A.CSMA/CA<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1574 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=B>B.CSMA/CB<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1574 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=C>C.CSMA/CD<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1574 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=D>D.CSMAJCF<BR></TD></TR>
  <TR class=trh1>
    <TD align=middle height=212 width=29>23 </TD>
    <TD align=left height=212 width=607>&nbsp; &nbsp; 
      采用可变长子网掩码技术可以把大的网络分成小的子网,例如把子网掩码为255.255.0.0的网络40.15.0.0分为两个子网,假设第一个子网为40.15.0.0/17,则第二个子网为 
      (46) 。&copy;) <BR>答: &nbsp;<INPUT class=radio name=text1578 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=A>A.40.15.1.0/17<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio 
      name=text1578 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=B>B.40.15.2.0/17<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio 
      name=text1578 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=C>C.40.15.100.0/17<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio 
      name=text1578 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=D>D.40.15.128.0/17<BR></TD></TR>
  <TR class=trh1>
    <TD align=middle height=212 width=29>24 </TD>
    <TD align=left height=212 width=607>&nbsp; &nbsp; 
      采用可变长子网掩码技术可以把大的网络分成小的子网,例如把子网掩码为255.255.0.0的网络40.15.0.0分为两个子网,假设用户Xl有2000台主机,则至少应给他分配 
      (47) 个C类网络&copy;) <BR>答: &nbsp;<INPUT class=radio name=text1579 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=A>A.4<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1579 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=B>B.8<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1579 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=C>C.10<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1579 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=D>D.16<BR></TD></TR>
  <TR class=trh1>
    <TD align=middle height=212 width=29>25 </TD>
    <TD align=left height=212 width=607>&nbsp; &nbsp; 
      采用可变长子网掩码技术可以把大的网络分成小的子网,假设给用户X2分配的C类网络号为196.25.16.0~196.25.31.0,则X2的子网掩码应为 
      (49) &copy;) <BR>答: &nbsp;<INPUT class=radio name=text1583 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=A>A.255.255.255.0 <BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio 
      name=text1583 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=B>B.255.255.250.0 <BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio 
      name=text1583 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=C>C.255.255.248.0<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio 
      name=text1583 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=D>D.255.255.240.0<BR></TD></TR>
  <TR class=trh1>
    <TD align=middle height=212 width=29>26 </TD>
    <TD align=left height=212 width=607>&nbsp; &nbsp; 
      在自治系统内部的各个路由器之间,运行的是内部网关协议IGP。它执行 (57) 。&copy;) <BR>答: &nbsp;<INPUT class=radio 
      name=text1594 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=A>A.路由选择算法<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1594 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=B>B.距离矢量算法<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1594 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=C>C.链路状态算法<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1594 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=D>D.内部网关算法<BR></TD></TR>
  <TR class=trh1>
    <TD align=middle height=212 width=29>27 </TD>
    <TD align=left height=212 width=607>&nbsp; &nbsp; IEEE802.5令牌环(Tokenm 
      Ring)网中,时延是由__(1)__决定。&copy;) <BR>答: &nbsp;<INPUT class=radio name=text1643 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=A>A.站点时延和信号传话时延<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio 
      name=text1643 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=B>B.令牌帧长短和数据帧长短<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio 
      name=text1643 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=C>C.电缆长度和站点个数<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio 
      name=text1643 onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=D>D.数据传输单和信号传播速度<BR></TD></TR>
  <TR class=trh1>
    <TD align=middle height=212 width=29>28 </TD>
    <TD align=left height=212 width=607>&nbsp; &nbsp; 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小时延是&copy;) 
      <BR>答: &nbsp;<INPUT class=radio name=text1645 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=A>A.1<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1645 
      onblur="this.className='radio'" 
      onfocus="this.className='inputedit';this.select()" type=radio 
      value=B>B.8<BR>&nbsp; &nbsp; &nbsp; <INPUT class=radio name=text1645 

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