📄 模拟考试4.htm
字号:
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.64<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>3 </TD>
<TD align=left height=212 width=607>
设信道带宽为3000Hz，根据尼奎斯特(Nyquist)定理，理想信道的波特率为 (16) 波特©) <BR>答： <INPUT
class=radio name=text1526 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.3000<BR> <INPUT class=radio name=text1526
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.6000<BR> <INPUT class=radio name=text1526
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.12000<BR> <INPUT class=radio name=text1526
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.24000<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>4 </TD>
<TD align=left height=212 width=607>
设信道带宽为3000Hz，根据尼奎斯特(Nyquist)定理，若采用QPSK调制，其数据速率应为 (17) ©) <BR>答：
<INPUT class=radio name=text1528 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.6Kb／s <BR> <INPUT class=radio name=text1528
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.12Kb／s<BR> <INPUT class=radio name=text1528
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.18Kb／s<BR> <INPUT class=radio name=text1528
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.24Kb／s<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>5 </TD>
<TD align=left height=212 width=607>
设信道带宽为3000Hz，根据尼奎斯特(Nyquist)定理，如果该信道信噪比为30dB，则该信道的带宽约为 (18) 。©) <BR>答：
<INPUT class=radio name=text1529 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.10Kb／s<BR> <INPUT class=radio name=text1529
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.20Kb／s<BR> <INPUT class=radio name=text1529
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.30Kb／s<BR> <INPUT class=radio name=text1529
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.40Kb／s<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>6 </TD>
<TD align=left height=212 width=607>
设信道带宽为3000Hz，根据尼奎斯特(Nyquist)定理，设信道误码率为10-5，帧长为10K比特，差错为单个错，则帧出错的概率为 (19)
。©) <BR>答： <INPUT class=radio name=text1531
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.1-(1-10-5)10K<BR> <INPUT class=radio
name=text1531 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.(1-10-5)10K<BR> <INPUT class=radio
name=text1531 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.10-5 X 10K<BR> <INPUT class=radio
name=text1531 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.(1-10-5) X 10K<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>7 </TD>
<TD align=left height=212 width=607> 如果网络中出现拥塞，则路由器产生一个_(25)_
报文。©) <BR>答： <INPUT class=radio name=text1542
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.超时<BR> <INPUT class=radio name=text1542
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.路由重定向<BR> <INPUT class=radio name=text1542
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.源端抑制<BR> <INPUT class=radio name=text1542
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.目标不可到达<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>8 </TD>
<TD align=left height=212 width=607> IPv6是下一代IP协议。IPv6的基本报头包含
(26) 个字节，此外还可以包含多今扩展报头。©) <BR>答： <INPUT class=radio name=text1544
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.16<BR> <INPUT class=radio name=text1544
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.32<BR> <INPUT class=radio name=text1544
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.40<BR> <INPUT class=radio name=text1544
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.60<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>9 </TD>
<TD align=left height=212 width=607> IPv6是下一代IP协议。基本报头中的 (27)
字段指明了一个特定的源站向一个特定目标站发送的分组序列，各个路由器要对该分组序列进行特殊的资源分配，以满足应用程序的特殊传输需求。©) <BR>答：
<INPUT class=radio name=text1547 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.负载长度<BR> <INPUT class=radio name=text1547
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.数据流标记<BR> <INPUT class=radio name=text1547
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.下一报头<BR> <INPUT class=radio name=text1547
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.8h数限制<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>10 </TD>
<TD align=left height=212 width=607> IPv6是下一代IP协议。一个数据流由 (28)
命名。©) <BR>答： <INPUT class=radio name=text1548
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.源地址、目标地址和流名称<BR> <INPUT class=radio
name=text1548 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.源地址、目标地址和流序号<BR> <INPUT class=radio
name=text1548 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.源地址、端口号和流序号<BR> <INPUT class=radio
name=text1548 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
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>11 </TD>
<TD align=left height=212 width=607> (30)
是IPv6的测试床，实际上是一个基于IPv4的虚拟网络，用于研究和测试IPv6的标准、实现以及IPv4向IPv6的转变过程。©) <BR>答：
<INPUT class=radio name=text1550 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.6bone<BR> <INPUT class=radio name=text1550
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.6bed<BR> <INPUT class=radio name=text1550
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.6backbone <BR> <INPUT class=radio
name=text1550 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.6plane<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>12 </TD>
<TD align=left height=212 width=607>
A向B发送消息P，并使用公钥体制进行数字签名。设E表示公钥，D表示私钥，则B要保留的证据是 (31) 。©) <BR>答： <INPUT
class=radio name=text1552 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.EA(P)<BR> <INPUT class=radio name=text1552
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.EB(P)<BR> <INPUT class=radio name=text1552
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.DA(P)<BR> <INPUT class=radio name=text1552
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.DB(P)<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>13 </TD>
<TD align=left height=212 width=607>
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>14 </TD>
<TD align=left height=212 width=607> 国际标准化组织制定的OSI网络管理协议是
(36) ©) <BR>答： <INPUT class=radio name=text1561
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.CMIP<BR> <INPUT class=radio name=text1561
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.LMMP<BR> <INPUT class=radio name=text1561
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.CMOT<BR> <INPUT class=radio name=text1561
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.SGMP<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>15 </TD>
<TD align=left height=212 width=607>
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'"
⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -