📄 模拟考试16.htm
字号:
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.16<BR> <INPUT class=radio name=text1506
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.32<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>3 </TD>
<TD align=left height=212 width=607>
为了进行差错控制，必须对传送的数据帧进行校验。接收端发现错误后采取的措施是 (3) 。©) <BR>答： <INPUT
class=radio name=text1509 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.自动纠错<BR> <INPUT class=radio name=text1509
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.报告上层协议<BR> <INPUT class=radio name=text1509
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.自动请求重发<BR> <INPUT class=radio name=text1509
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.重新生成原始数据<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>4 </TD>
<TD align=left height=212 width=607>
为了进行差错控制，必须对传送的数据帧进行校验。要检查出d位错，码字之间的海明距离最小值应为(5)。©) <BR>答： <INPUT
class=radio name=text1512 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.d<BR> <INPUT class=radio name=text1512
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.d+l<BR> <INPUT class=radio name=text1512
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.d—1<BR> <INPUT class=radio name=text1512
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.2d+l<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>5 </TD>
<TD align=left height=212 width=607> TCP使用 (7) 次握手协议建立连接。©)
<BR>答： <INPUT class=radio name=text1515
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.1<BR> <INPUT class=radio name=text1515
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.2<BR> <INPUT class=radio name=text1515
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.3<BR> <INPUT class=radio name=text1515
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.4<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>6 </TD>
<TD align=left height=212 width=607> TCP使用的流量控制协议是 (10) 。©)
<BR>答： <INPUT class=radio name=text1519
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.固定大小的滑动窗口协议<BR> <INPUT class=radio
name=text1519 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.可变大小的滑动窗口协议<BR> <INPUT class=radio
name=text1519 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.后退N帧ARQ协议<BR> <INPUT class=radio
name=text1519 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.选择重发ARQ协议<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>7 </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>8 </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>9 </TD>
<TD align=left height=212 width=607>
设信道带宽为3000Hz，根据尼奎斯特(Nyquist)定理，若整个报文被分成5个帧，帧出错的概率为0.1，纠错重发以报文为单位，则整个报文的平均发送次数约为
(20) 次。©) <BR>答： <INPUT class=radio name=text1533
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.1.24<BR> <INPUT class=radio name=text1533
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.1.33<BR> <INPUT class=radio name=text1533
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.1.54 <BR> <INPUT class=radio name=text1533
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.1.69<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>10 </TD>
<TD align=left height=212 width=607>
ICMP协议属于TCP／IP网络中的(21)协议©) <BR>答： <INPUT class=radio name=text1534
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.数据链路层<BR> <INPUT class=radio name=text1534
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.网络层<BR> <INPUT class=radio name=text1534
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.传输层<BR> <INPUT class=radio name=text1534
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.会话层<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>11 </TD>
<TD align=left height=212 width=607> ICMP报文封装在 (22)
协议数据单元中传送，在网络中起着差错和拥塞控制的作用。©) <BR>答： <INPUT class=radio
name=text1535 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.IP<BR> <INPUT class=radio name=text1535
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.TCP<BR> <INPUT class=radio name=text1535
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.UDP<BR> <INPUT class=radio name=text1535
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.PPP<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>12 </TD>
<TD align=left height=212 width=607>
如果在IP数据报传送过程中，发现生命期(TTL)字段为零，则路由器发出 (24) 报文。©) <BR>答： <INPUT
class=radio name=text1540 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.超时<BR> <INPUT class=radio name=text1540
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=text1540
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.源端抑制<BR> <INPUT class=radio name=text1540
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>13 </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>14 </TD>
<TD align=left height=212 width=607>
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) 。©)
<BR>答： <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>
<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>
<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>
<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>15 </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
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