📄 模拟考试19.htm
字号:
value=B>B.MODEM就绪→DTE就绪→请求发送→允许发送→发数据→清请求发送→清允许发送→清DTE就绪→清MODEM就绪<BR>
<INPUT class=radio name=text1957
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.DTE就绪→MODEM就绪→请求发送→允许发送→发数据→清请求发送→清允许发送→清MODEM就绪→清DTE就绪<BR>
<INPUT class=radio name=text1957
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.DTE就绪→MODEM就绪→请求发送→允许发送→发数据→清请求发送→清允许发送→清DTE就绪→清MODEM就绪<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>42 </TD>
<TD align=left height=212 width=607> 信元传输采用__(52)__。©) <BR>答：
<INPUT class=radio name=text1959 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio value=A>A.
TDM<BR> <INPUT class=radio name=text1959
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.FDM<BR> <INPUT class=radio name=text1959
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.WDM<BR> <INPUT class=radio name=text1959
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.ATDM<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>43 </TD>
<TD align=left height=212 width=607> 当 AAL 层采用 AAL5
协议传输数据时，可以达到的有效数据传输率（除去开销）为__(55)__。 ATM 网络中使用信元作为传输数据的单位， ©) <BR>答：
<INPUT class=radio name=text1962 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.85% <BR> <INPUT class=radio name=text1962
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.87%<BR> <INPUT class=radio name=text1962
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.89%<BR> <INPUT class=radio name=text1962
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.90% <BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>44 </TD>
<TD align=left height=212 width=607> 配置 WWW 服务器是 UNIX
操作平台的重要工作之一，而 Apach 目前是应用最为广泛的 Web 服务器产品之一，__(56)__是 apache 的主要配置文件。©)
<BR>答： <INPUT class=radio name=text1963
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.httpd.conf<BR> <INPUT class=radio
name=text1963 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.srm.conf<BR> <INPUT class=radio
name=text1963 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.access.conf<BR> <INPUT class=radio
name=text1963 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.apache.conf<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>45 </TD>
<TD align=left height=212 width=607> 设置 index.html 或
default.html 为目录下默认文档的指令是__(59)__©) <BR>答： <INPUT class=radio
name=text1966 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.IndexOptions<BR> <INPUT class=radio
name=text1966 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.DirectoryIndex<BR> <INPUT class=radio
name=text1966 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.DirectoryDefault<BR> <INPUT class=radio
name=text1966 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.Indexlgnore<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>46 </TD>
<TD align=left height=212 width=607>
下图为曼彻斯特编码(表示的数据可能为___(1)___©) <BR>
<CENTER><IMG border=0 src="模拟考试19.files/2004813165711.bmp">
</CENTER><BR>答： <INPUT class=radio name=text1968
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.10100<BR> <INPUT class=radio name=text1968
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.01110<BR> <INPUT class=radio name=text1968
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.10101<BR> <INPUT class=radio name=text1968
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.00011<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>47 </TD>
<TD align=left height=212 width=607>
图为曼彻斯特编码这种编码适用的网络是___(2)___。 ©) <BR>
<CENTER><IMG border=0 src="模拟考试19.files/20048131658261.bmp">
</CENTER><BR>答： <INPUT class=radio name=text1969
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.广域网<BR> <INPUT class=radio name=text1969
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.城域网<BR> <INPUT class=radio name=text1969
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.局域网<BR> <INPUT class=radio name=text1969
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.任意网<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>48 </TD>
<TD align=left height=212 width=607> 元是信元交换的单位。为控制差错，在信元中包括
CRC 校验和，校验和对___(7)___进行校验。 ©) <BR>答： <INPUT class=radio
name=text1973 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.整个信元<BR> <INPUT class=radio name=text1973
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.信元头<BR> <INPUT class=radio name=text1973
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.信元载荷(用户数据)<BR> <INPUT class=radio
name=text1973 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.信元的地址域<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>49 </TD>
<TD align=left height=212 width=607> 信元交换在交换过程中，当实施 VP 交换时，其中
VPl、VCI 的变化情况是___(9)___。 ©) <BR>答： <INPUT class=radio name=text1975
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio value=A>A.
VPI、VCI都不变<BR> <INPUT class=radio name=text1975
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.VPI、VCI根据需要变化<BR> <INPUT class=radio
name=text1975 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.VPI不变、VCI根据需要变化<BR> <INPUT class=radio
name=text1975 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.VCI不变、VPI根据需要变化<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>50 </TD>
<TD align=left height=212 width=607> MODEM
收到呼叫信号后向计算机发送的信号是___(12)___。©) <BR>答： <INPUT class=radio
name=text1978 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.接收数据<BR> <INPUT class=radio name=text1978
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.载波检测<BR> <INPUT class=radio name=text1978
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.MODEM 就绪<BR> <INPUT class=radio
name=text1978 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.呼叫(振铃)指示<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>51 </TD>
<TD align=left height=212 width=607> 当数据发送完毕，计算机向 MODEM
发送的信号是清除___(13)___©) <BR>答： <INPUT class=radio name=text1979
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio value=A>A.
'DTE就绪'<BR> <INPUT class=radio name=text1979
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.'请求发送'<BR> <INPUT class=radio name=text1979
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.'MODEM就绪'<BR> <INPUT class=radio
name=text1979 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.'允许发送'<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>52 </TD>
<TD align=left height=212 width=607> 计算机向 MODEM 发送的信号后MODEM
随后向计算机发送清除___(14)___信号作为应答。 ©) <BR>答： <INPUT class=radio
name=text1980 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio value=A>A.
'DTE就绪'<BR> <INPUT class=radio name=text1980
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.'请求发送'<BR> <INPUT class=radio name=text1980
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.'MODEM就绪'<BR> <INPUT class=radio
name=text1980 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio value=D>D.
'允许发送'<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>53 </TD>
<TD align=left height=212 width=607> 对一路信号进行 FSK 调制时，若载波频率为
fc , 调制后的信号频率分别为 f1 和 f2 (f1<F2)，则三者的关系是___(16)___。©) <br> 答：
<INPUT class=radio name=text1982 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.fc-f1=f2-fc<BR> <INPUT class=radio
name=text1982 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.f2-f1 = fc<BR> <INPUT class=radio
name=text1982 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.f2+f1 = fc<BR> <INPUT class=radio
name=text1982 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.f1*f2 = fc<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>54 </TD>
<TD align=left height=212 width=607> 对一路信号进行 FSK 调制时，若载波频率为
fc , 调制后的信号频率分别为 f1 和 f2 (f1<F2)，当对多路信号进行调制时，调制⌨️ 快捷键说明
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