?? 模擬考試28.htm
字號:
value=A>A.50<BR> <INPUT class=radio name=text1649
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.100<BR> <INPUT class=radio name=text1649
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.200<BR> <INPUT class=radio name=text1649
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.400<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>29 </TD>
<TD align=left height=212 width=607> 在一個帶寬為
3KHZ、沒有噪聲的信道,傳輸二進制信號時能夠達到的極限數據傳輸率為__(6)__。©) <BR>答: <INPUT
class=radio name=text1651 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.3Kbps<BR> <INPUT class=radio name=text1651
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.6Kbps<BR> <INPUT class=radio name=text1651
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.56Kbps<BR> <INPUT class=radio name=text1651
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.10Mbps<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>30 </TD>
<TD align=left height=212 width=607> 在一個帶寬為
3KHZ、沒有噪聲的信道,一個帶寬為 3KHZ、信噪比為 30dB 的信道。上述結果表明,__(8)__。©) <BR>答:
<INPUT class=radio name=text1655 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.有噪聲信道比無噪聲信道具有更大的帶寬<BR> <INPUT class=radio
name=text1655 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.有噪聲信道比無噪聲信道可達到更高的極限數據傳輸率<BR> <INPUT
class=radio name=text1655 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.有噪聲信道與無噪聲信道沒有可比性<BR> <INPUT class=radio
name=text1655 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.上述值都為極限值,條件不同,不能進行直接的比較<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>31 </TD>
<TD align=left height=212 width=607> 根據奈奎斯特第一定理,為了保證傳輸質量,為達到
3KbpS 的數據傳輸車需要的帶寬為___(9)___。©) <BR>答: <INPUT class=radio
name=text1657 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.3KHz<BR> <INPUT class=radio name=text1657
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.6KHz<BR> <INPUT class=radio name=text1657
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.2KHz<BR> <INPUT class=radio name=text1657
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.56KHz<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>32 </TD>
<TD align=left height=212 width=607>
在一個無限帶寬的無噪聲信道上,傳輸二進制信號,當信號的帶寬為 3KHz 時,能達到的極限數據傳輸率為__(10)__Kbps 。©) <BR>答:
<INPUT class=radio name=text1659 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.1.5<BR> <INPUT class=radio name=text1659
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.3<BR> <INPUT class=radio name=text1659
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.6<BR> <INPUT class=radio name=text1659
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio value=D>D.3
log23<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>33 </TD>
<TD align=left height=212 width=607> 與線路交換相比,最大的缺點是__(12)__©)
<BR>答: <INPUT class=radio name=text1663
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.增大延遲<BR> <INPUT class=radio name=text1663
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.不能實現鏈路共享<BR> <INPUT class=radio
name=text1663 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.不能實現速率轉換<BR> <INPUT class=radio
name=text1663 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.不能滿足實時應用要求<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>34 </TD>
<TD align=left height=212 width=607> 與線路交換相比,設待傳送數據總長度為 L
位分組長度為 P 位,其中頭部開銷長度為 H 位,源節點到目 的節點之間的鏈路數為 h,每個鍵路上的延遲時間為 D 秒,數據傳輸率為 B
bps,線路交換和虛電路建立連接的時間都為 S 秒,在分組交換方式下每個中間節點產生 d
位的延遲時間,則傳送所有數據,線路交換需時間為__(13)__秒©) <BR>答: <INPUT class=radio
name=text1665 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.hD+L/B<BR> <INPUT class=radio name=text1665
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.S+hD+L/P<BR> <INPUT class=radio
name=text1665 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.S+hD+L/B<BR> <INPUT class=radio
name=text1665 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.S+L/B<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>35 </TD>
<TD align=left height=212 width=607> 與線路交換相比,設待傳送數據總長度為 L
位分組長度為 P 位,其中頭部開銷長度為 H 位,源節點到目 的節點之間的鏈路數為 h,每個鍵路上的延遲時間為 D 秒,數據傳輸率為 B
bps,線路交換和虛電路建立連接的時間都為 S 秒,在分組交換方式下每個中間節點產生 d
位的延遲時間,則傳送所有數據,虛電路分組交換所需時間為__(14)__秒©) <BR>答: <INPUT class=radio
name=text1667 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.S+(hd/B+P/B)*[L/(P-H)]<BR> <INPUT
class=radio name=text1667 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.S+(hD+P/B)*[L/(P-H)]<BR> <INPUT class=radio
name=text1667 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio value=C>C.
S+[(h-1)D+P/B]*[L/(P-H)]<BR> <INPUT class=radio
name=text1667 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.S+[(h-1)d/B+hD+P/B]*{L/(P-H)]<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>36 </TD>
<TD align=left height=212 width=607> 與線路交換相比,設待傳送數據總長度為 L
位分組長度為 P 位,其中頭部開銷長度為 H 位,源節點到目 的節點之間的鏈路數為 h,每個鍵路上的延遲時間為 D 秒,數據傳輸率為 B
bps,線路交換和虛電路建立連接的時間都為 S 秒,在分組交換方式下每個中間節點產生 d
位的延遲時間,則傳送所有數據,數據報分組交換所需時間為__(15)__秒。©) <BR>答: <INPUT class=radio
name=text1669 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio value=A>A.
(hd/B+P/B)*[L/(P-H)]<BR> <INPUT class=radio
name=text1669 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.(hD+P/B)*[L/(P-H)] <BR> <INPUT class=radio
name=text1669 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.[(h-1)d/B+hD+P/B]*[L/(P-H)]<BR> <INPUT
class=radio name=text1669 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio value=D>D.
[(h-1)d/B+hD+P/B]*[L/P]<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>37 </TD>
<TD align=left height=212 width=607> 圖一為兩個局域網 LAN1 和 LAN2
通過網橋 1 和網橋 2 互連后形成的網絡結構。設站 A
發送一個幀,但其目的地址均不在這兩個網橋的地址轉發表中,為了有效地解決該類問題,可以在每個網橋中引入生成樹算法,這樣一來__(19)__。 ©)
<BR>
<CENTER><IMG border=0 src="模擬考試28.files/200481394349wso3x8.gif">
</CENTER><BR>答: <INPUT class=radio name=text1679
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.網絡資源也會得到充分利用<BR> <INPUT class=radio
name=text1679 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.網絡的最佳路由也會得到確定<BR> <INPUT class=radio
name=text1679 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.也限制了網絡規模<BR> <INPUT class=radio
name=text1679 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.也增加了網絡延時<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>38 </TD>
<TD align=left height=212 width=607> 在使用路由器 R 的 TCP/IP
網絡中,兩主機通過一路由器互聯,提供主機 A 和主機 B 應用層之間通信的層是__(21)__©) <BR>答: <INPUT
class=radio name=text1684 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.應用層<BR> <INPUT class=radio name=text1684
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.傳輸層<BR> <INPUT class=radio name=text1684
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.IP層<BR> <INPUT class=radio name=text1684
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.網絡接口層<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>39 </TD>
<TD align=left height=212 width=607> 對照 ISO/OSI
參考模型各個層中的網絡安全服務,在數據鏈路層,可以采用__(27)__進行鏈路加密©) <BR>答: <INPUT
class=radio name=text1694 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.公鑰基礎<BR> <INPUT class=radio name=text1694
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.Kerberos 鑒別<BR> <INPUT class=radio
name=text1694 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.通信保密機 <BR> <INPUT class=radio name=text1694
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio value=D>D.CA
認證中心<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>40 </TD>
<TD align=left height=212 width=607> TCP
是一個面向連接的協議,它提供連接的功能是__(31)__的©) <BR>答: <INPUT class=radio
name=text1703 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio value=A>A.
全雙工<BR> <INPUT class=radio name=text1703
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.半雙工<BR> <INPUT class=radio name=text1703
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.單工<BR> <INPUT class=radio name=text1703
onblur="this.className='radio'"
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