📄 模拟考试23.htm
字号:
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>3 </TD>
<TD align=left height=212 width=607>
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>
<TR class=trh1>
<TD align=middle height=212 width=29>4 </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，适用这种业务的ATM适配层是 (14) ©) <BR>答：
<INPUT class=radio name=text1524 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.AAL1<BR> <INPUT class=radio name=text1524
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.AAL2<BR> <INPUT class=radio name=text1524
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.AAL3/4<BR> <INPUT class=radio name=text1524
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.AAL5<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>5 </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>
<TR class=trh1>
<TD align=middle height=212 width=29>6 </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>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，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>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，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>9 </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>10 </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>
<TR class=trh1>
<TD align=middle height=212 width=29>11 </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>12 </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>
<TR class=trh1>
<TD align=middle height=212 width=29>13 </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。基于数论原理的RSA算法的安全性建立在 (32) 的基础上。©) <BR>答：
<INPUT class=radio name=text1553 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.大数难以分解因子<BR> <INPUT class=radio
name=text1553 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.大数容易分解因子<BR> <INPUT class=radio
name=text1553 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.容易获得公钥<BR> <INPUT class=radio name=text1553
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.私钥容易保密<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>14 </TD>
<TD align=left height=212 width=607>
IAB制定的网络管理协议是SNMP，在SNMP管理框架中使用的管理信息库为 (38) 。©) <BR>答： <INPUT
class=radio name=text1565 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.MIB—1<BR> <INPUT class=radio name=text1565
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.MIB-2<BR> <INPUT class=radio name=text1565
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.MIB—3<BR> <INPUT class=radio name=text1565
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.MIB-4<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>15 </TD>
<TD align=left height=212 width=607>
IEEE802．11定义了无线局域网的两种工作模式，其中的 (41)
模式是一种点对点连接的网络，不需要无线接入点和有线网络的支持，用无线网卡连接的设备之间可以直接通信。©) <BR>答： <INPUT
class=radio name=text1570 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.Roaming<BR> <INPUT class=radio name=text1570
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.AdHoc<BR> <INPUT class=radio name=text1570
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
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