📄 模拟考试26.htm
字号:
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>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>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>
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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>
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采用短的、固定长度的信元，为使用硬件进行高速，数据交换创造了条件。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，CBR(ConstantBitRate)模拟
(13) 业务©) <BR>答： <INPUT class=radio name=text1522
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.报文交换<BR> <INPUT class=radio name=text1522
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.分组交换<BR> <INPUT class=radio name=text1522
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.电路交换<BR> <INPUT class=radio name=text1522
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.时分交换<BR></TD></TR>
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<TD align=middle height=212 width=29>9 </TD>
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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>
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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>
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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>
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<TD align=middle height=212 width=29>13 </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>14 </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>
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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。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>
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