試題1

以下關(guān)于FTP和TFTP描述中，正確的是  （ ）  。
A、FTP和TFTP都基于TCP協(xié)議
B、FTP和TFTP都基于UDP協(xié)議
C、FTP基于TCP協(xié)議，TFTP基于UDP協(xié)議
D、FTP基于UDP協(xié)議，TFTP基于TCP協(xié)議

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試題2

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試題3

IEEE 802.11采用了類似于802.3 CSMA/CD協(xié)議的CSMA/CA協(xié)議，之所以不采用CSMA/CD協(xié)議的原因是 （ ） 。
A、CSMA/CA協(xié)議的效率更高
B、CSMA/CD協(xié)議的開銷更大
C、為了解決隱蔽終端問題
D、為了引進(jìn)其他業(yè)務(wù)

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試題4

在 xDSL 技術(shù)中，能提供上下行信道非對(duì)稱傳輸?shù)募夹g(shù)是（ ）。
A．HDSL
B．ADSL
C．SDSL
D．ISDN DSL

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試題5

某計(jì)算機(jī)的時(shí)鐘頻率為400MHz，測試該計(jì)算機(jī)程序使用4種類型的指令。每種指令的數(shù)量及所需指令時(shí)鐘數(shù)（CPI）如下表所示，則該計(jì)算機(jī)的指令平均時(shí)鐘數(shù)約為 （ ） 。





A、1.85
B、1.93
C、2.36
D、3.75

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試題6

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試題7

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試題8

Network Addrees Translation(NAT) is an Internet standard that enables a local-area network to use one set of IP addresses for internet traffic and another set of ( ) IP addresses for external traffic. The main use of NAT is to limit the number of public IP addresses that an organization or company must use, for both economy and ( ) purposes. NAT remaps an IP address space into another by modifying network address information in the ( ) header of packets while they are in transit across a traffic routing device. It has become an essential tool in conserving global address space in the face of ( ) address exhaustion. When a packet traverses outside the local network, NAT converts the private IP address to a public IP address. If NAT runs out of public addresses，the packets will be dropped and ( )"host unreachable"packets will be sent.
(1) A. local
B. private
C. public
D. dynamic
(2) A. political
B. fairness
C. efficiency
D. security
(3) A.MAC
B. IP
C.TCP
D. UDP
(4) A. IPv4
B. IPv6
C. MAC
D. logical
(5) A. BGP
B. IGMP
C. ICMP
D. SNMP

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試題9

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試題10

在windows操作系統(tǒng)中，采用 （ ） 命令來測試到達(dá)目標(biāo)所經(jīng)過的路由器數(shù)目及IP地址。
A、ping
B、tracert
C、arp
D、nslookup

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