?? 模擬考試26.htm
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<H3 align=center><FONT color=#0000ff>您現(xiàn)在正在參加網(wǎng)絡(luò)工程師考試</FONT></H3>
<CENTER>考試時(shí)間150分鐘 0:35:00 到 3:05:00 出卷人：最高管理員</CENTER>
<TABLE border=1 borderColor=#799ae1 cellSpacing=1 height=138
style="BORDER-COLLAPSE: collapse" width="100%">
<TBODY>
<TR class=trh>
<TD align=middle bgColor=#799ae1 height=19 width=30><FONT
color=#ffffff><B>序號</B></FONT></TD>
<TD align=middle bgColor=#799ae1 height=19 width=606>
<P align=center><FONT color=#ffffff><B>填空題<SPAN
lang=en-us>(</SPAN>共1題<SPAN lang=en-us>,5</SPAN>分<SPAN
lang=en-us>)</SPAN></B></FONT></P></TD></TR>
<TR class=trh1>
<TD align=middle height=96 width=30>1 </TD>
<TD align=left height=96 width=606>
光纜傳輸中，亮度調(diào)制實(shí)際是_____調(diào)制方式。©) <BR>答： <INPUT class=inputnormalleft
name=text2919 onblur="this.className='inputnormalleft'"
onfocus="this.className='inputedit';this.select()" size=80> <BR></TD></TR>
<TR>
<TD align=middle bgColor=#ffffff borderColor=#ffffff colSpan=2 height=21
width=640><SPAN
lang=en-us>
</SPAN><INPUT class=s02 name=B1 type=submit value=保存填空題>
</TD></TR></TBODY></TABLE>
<TABLE border=1 borderColor=#799ae1 cellSpacing=1 height=265
style="BORDER-COLLAPSE: collapse" width="100%">
<TBODY>
<TR class=trh>
<TD align=middle bgColor=#799ae1 height=21 width=29><FONT
color=#ffffff><B>序號</B></FONT></TD>
<TD align=middle bgColor=#799ae1 height=21 width=607>
<P align=center><FONT color=#ffffff><B>單項(xiàng)選擇題<SPAN
lang=en-us>(</SPAN>共75題,75分<SPAN lang=en-us>)</SPAN></B></FONT></P></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>1 </TD>
<TD align=left height=212 width=607>
為了進(jìn)行差錯(cuò)控制，必須對傳送的數(shù)據(jù)幀進(jìn)行校驗(yàn)。CRC—16標(biāo)準(zhǔn)規(guī)定的生成多項(xiàng)式為G(x)=X16+X15+X2+l，它產(chǎn)生的校驗(yàn)碼是 __(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>
<TR class=trh1>
<TD align=middle height=212 width=29>2 </TD>
<TD align=left height=212 width=607>
為了進(jìn)行差錯(cuò)控制，必須對傳送的數(shù)據(jù)幀進(jìn)行校驗(yàn)。如果CRC的生成多項(xiàng)式為G(X)=X4+X+1，信息碼字為10110，則計(jì)算出的CRC校驗(yàn)碼是 (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
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