📄 模拟考试25.htm
字号:
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>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。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>4 </TD>
<TD align=left height=212 width=607> TCP是互联网中的 (6) 协议©)
<BR>答： <INPUT class=radio name=text1514
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.传输层<BR> <INPUT class=radio name=text1514
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.网络层<BR> <INPUT class=radio name=text1514
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.会话层<BR> <INPUT class=radio name=text1514
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.应用层<BR></TD></TR>
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<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>
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<TD align=middle height=212 width=29>6 </TD>
<TD align=left height=212 width=607> 当主动方发出SYN连接请求后，等待对方回答
(8) 。©) <BR>答： <INPUT class=radio name=text1517
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.SYN,ACK<BR> <INPUT class=radio name=text1517
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.FIN,ACK<BR> <INPUT class=radio name=text1517
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.PSH,ACK<BR> <INPUT class=radio name=text1517
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.RST，ACK<BR></TD></TR>
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<TD align=middle height=212 width=29>7 </TD>
<TD align=left height=212 width=607> ATM网络采用 (11) 多路技术传送信元©)
<BR>答： <INPUT class=radio name=text1520
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.统计时分<BR> <INPUT class=radio name=text1520
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.同步时分<BR> <INPUT class=radio name=text1520
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.频分<BR> <INPUT class=radio name=text1520
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.码分<BR></TD></TR>
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<TD align=middle height=212 width=29>8 </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>
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<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>
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<TD align=middle height=212 width=29>10 </TD>
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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>
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<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>
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<TD align=middle height=212 width=29>12 </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>
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<TD align=middle height=212 width=29>13 </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>
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<TD align=middle height=212 width=29>14 </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>15 </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。Kerberos是MIT为校园网设计的身份认证系统，该系统利用智能卡产生 (33)
密钥，可以防止窃听者捕获认证信息。©) <BR>答： <INPUT class=radio name=text1555
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.私有<BR> <INPUT class=radio name=text1555
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.加密<BR> <INPUT class=radio name=text1555
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.一次性<BR> <INPUT class=radio name=text1555
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.会话<BR></TD></TR>
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