📄 模拟考试25.htm
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<TD align=middle height=212 width=29>16 </TD>
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A向B发送消息P，并使用公钥体制进行数字签名。为了防止会话劫持，Kerberos提供了 (34) 机制©) <BR>答： <INPUT
class=radio name=text1557 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.连续加密<BR> <INPUT class=radio name=text1557
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.报文认证<BR> <INPUT class=radio name=text1557
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.数字签名<BR> <INPUT class=radio name=text1557
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.密钥分发<BR></TD></TR>
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<TD align=middle height=212 width=29>17 </TD>
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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)。©) <BR>答：
<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> <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> <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> <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>18 </TD>
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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) 。©) <BR>答： <INPUT
class=radio name=text1565 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.MIB—1<BR> <INPUT class=radio name=text1565
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.MIB-2<BR> <INPUT class=radio name=text1565
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.MIB—3<BR> <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>19 </TD>
<TD align=left height=212 width=607>
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。©) <BR>答： <INPUT class=radio name=text1566
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.Information<BR> <INPUT class=radio
name=text1566 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.Exception<BR> <INPUT class=radio
name=text1566 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.Trap<BR> <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>20 </TD>
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IEEE802．11的物理层规定了三种传输技术，即红外技术、直接序列扩频(DSSS)和跳频扩频(FHSS)技术，后两种扩频技术都工作在 (42)
的ISM频段。©) <BR>答： <INPUT class=radio name=text1572
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.600MHz<BR> <INPUT class=radio name=text1572
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.800MHz<BR> <INPUT class=radio name=text1572
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.2．4GHz<BR> <INPUT class=radio name=text1572
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.19．2GHz<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>21 </TD>
<TD align=left height=212 width=607> 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©) <BR>答： <INPUT class=radio
name=text1574 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.CSMA／CA<BR> <INPUT class=radio name=text1574
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.CSMA／CB<BR> <INPUT class=radio name=text1574
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.CSMA／CD<BR> <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>22 </TD>
<TD align=left height=212 width=607>
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©) <BR>答： <INPUT class=radio name=text1579
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.4<BR> <INPUT class=radio name=text1579
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.8<BR> <INPUT class=radio name=text1579
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.10<BR> <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>23 </TD>
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采用可变长子网掩码技术可以把大的网络分成小的子网，如果分配给用户Xl的网络号为196．25．64．0，则指定给Xl的子网掩码为 (48) ©)
<BR>答： <INPUT class=radio name=text1581
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.255．255．255．0<BR> <INPUT class=radio
name=text1581 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.255．255．250．0<BR> <INPUT class=radio
name=text1581 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.255．255．248．0<BR> <INPUT class=radio
name=text1581 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>24 </TD>
<TD align=left height=212 width=607>
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) ©) <BR>答： <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> <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> <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> <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>
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<TD align=middle height=212 width=29>25 </TD>
<TD align=left height=212 width=607> Linux中一种常用的引导工具是 (51) ©)
<BR>答： <INPUT class=radio name=text1586
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.reboot<BR> <INPUT class=radio name=text1586
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.1ilo<BR> <INPUT class=radio name=text1586
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.gone<BR> <INPUT class=radio name=text1586
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.restart<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>26 </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>27 </TD>
<TD align=left height=212 width=607> IEEE802.5令牌环（Tokenm
Ring）网中，时延是由__(1)__决定。©) <BR>答： <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> <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> <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> <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> 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>
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