📄 模拟考试20.htm
字号:
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>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。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。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>
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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。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>6 </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>
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<TD align=middle height=212 width=29>7 </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>
<TR class=trh1>
<TD align=middle height=212 width=29>8 </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>9 </TD>
<TD align=left height=212 width=607>
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>10 </TD>
<TD align=left height=212 width=607>
ATM是为B-ISDN定义的传输和交换方式，可以适应各种不同特性的电信业务，用于ATM局域网仿真的ATM适配层是 (15) ©) <BR>答：
<INPUT class=radio name=text1525 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.AAL1<BR> <INPUT class=radio name=text1525
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.AAL2<BR> <INPUT class=radio name=text1525
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.AAL3/4<BR> <INPUT class=radio name=text1525
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.AAL5<BR></TD></TR>
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<TD align=middle height=212 width=29>11 </TD>
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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>12 </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>
<TR class=trh1>
<TD align=middle height=212 width=29>13 </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>14 </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>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
value=C>C.6backbone <BR> <INPUT class=radio
name=text1550 onblur="this.className='radio'"
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