📄 模拟考试3.htm
字号:
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.32<BR></TD></TR>
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<TD align=middle height=212 width=29>3 </TD>
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为了进行差错控制，必须对传送的数据帧进行校验。CRC—16标准规定的生成多项式为G(x)=X16+X15+X2+l，它产生的校验码是 __(2)
位©) <BR>答： <INPUT class=radio name=text1506
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.2<BR> <INPUT class=radio name=text1506
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.4<BR> <INPUT class=radio name=text1506
onblur="this.className='radio'"
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>
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<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。如果CRC的生成多项式为G(X)=X4+X+1，信息码字为10110，则计算出的CRC校验码是 (4)
。©) <BR>答： <INPUT class=radio name=text1510
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.0100<BR> <INPUT class=radio name=text1510
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.1010<BR> <INPUT class=radio name=text1510
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.0111<BR> <INPUT class=radio name=text1510
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.1111<BR></TD></TR>
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<TD align=middle height=212 width=29>5 </TD>
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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>
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<TD align=middle height=212 width=29>6 </TD>
<TD align=left height=212 width=607> TCP这种建立连接的方法可以防止 (9) 。©)
<BR>答： <INPUT class=radio name=text1518
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.出现半连接<BR> <INPUT class=radio name=text1518
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.无法连接<BR> <INPUT class=radio name=text1518
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.假冒的连接<BR> <INPUT class=radio name=text1518
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.产生错误的连接<BR></TD></TR>
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<TD align=middle height=212 width=29>7 </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>
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<TD align=middle height=212 width=29>8 </TD>
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ATM典型的数据速率为155.5Mb／s，这样每秒大约可以传送 (12) 万个信元。©) <BR>答： <INPUT
class=radio name=text1521 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.24<BR> <INPUT class=radio name=text1521
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.36<BR> <INPUT class=radio name=text1521
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.56<BR> <INPUT class=radio name=text1521
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>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，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>10 </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>
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<TD align=middle height=212 width=29>11 </TD>
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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>
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<TD align=middle height=212 width=29>12 </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>13 </TD>
<TD align=left height=212 width=607> ICMP有13种报文，常用的ping程序中使用了
(23) 报文，以探测目标主机是否可以到达。©) <BR>答： <INPUT class=radio name=text1538
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.地址掩码请求／响应<BR> <INPUT class=radio
name=text1538 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.回送请求脏答<BR> <INPUT class=radio name=text1538
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.信息请求／响应<BR> <INPUT class=radio name=text1538
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.时间戳请求／响应<BR></TD></TR>
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<TD align=middle height=212 width=29>14 </TD>
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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>
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<TD align=middle height=212 width=29>15 </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
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