試題1

Border Gateway Protocol(BGP) is inter-autonomous system  (1)  protocol. BGP is based on a routing method called path vector routing. Distance vector routing is not a good candidate for inter-autonomous system routing because there are occasions on which the route with the smallest  (2)  count is not the preferred route. For example, we may not want a packet through an autonomous system that is not secure even though it is shortest route. Also, distance vector routing is unstable due to the fact that the routers announce only the number of hop counts to the destination without defining the path that leads to that  (3)  . A router that receives a distance vector advertisement packet may be fooled if the shortest path is actually calculated through the receiving router itself. Link  (4)  routing is also not a good candidate for inter-autonomous system routing because an internet is usually too big for this routing method. To use link state routing for the whole internet would require each router to have a huge link state database. It would also take a long time for each router to calculate its routing  (5)  using the Dijkstra algorism.
（1）A、routing
B、switching
C、transmitting
D、receiving
（2）A、path
B、hop
C、route
D、packet
（3）A、connection
B、window
C、source
D、destination
（4）A、status
B、search
C、state
D、research
（5）A、table
B、state
C、metric
D、cost

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試題2

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試題3

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試題4

下面幾個網(wǎng)絡管理工具的描述中，錯誤的是  （ ）  。
A、netstat 可用于顯示IP、TCP、UDP、ICMP等協(xié)議的統(tǒng)計數(shù)據(jù)
B、sniffer 能夠使網(wǎng)絡接口處于雜收模式，從而可截獲網(wǎng)絡上傳輸?shù)姆纸M
C、winipcfg 采用MS-DOS工作方式顯示網(wǎng)絡適配器和主機的有關信息
D、tracert 可以發(fā)現(xiàn)數(shù)據(jù)包到達目標主機所經(jīng)過的路由器和到達時間

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試題5

Networks can be interconnected by different devices.In the physical layer,  networks can be connected by  （1）  or hubs, which just move the bits from one network to an identical network. One layer up we find bridges and switches, which operate at data link layer. They can accept  （2） , examine the MAC address, and forward the frames to a different network while doing minor protocol translation in the process. In the network layer, we have routers that can connect two networks, If two networks have  （3）  network layer, the router may be able to translate between the packer formats. In the transport layer we find transport gateway, which can interface between two transport connections.Finally, in the application layer, application gateways translate message  （4） . As an example, gateways between Internet e-mail and X.400 e-mail must  （5）  the e-mail message and change various header fields.
（1）A、repeaters
B、relays
C、connectors
D、modems
（2）A、frames
B、packets
C、packages
D、cells
（3）A、special
B、dependent
C、similar
D、dissimilar
（4）A、syntax
B、semantics
C、language
D、format
（5）A、analyze
B、parse
C、delete
D、create

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試題6

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試題7

以下關于X.25網(wǎng)絡的描述中，正確的是 （ ） 。
A、X.25的網(wǎng)絡層提供無連接的服務
B、X.25的網(wǎng)絡丟失幀時，通過檢查幀順序號重傳丟失幀
C、X.25的網(wǎng)絡使用LAP-D作為傳輸控制協(xié)議
D、X.25的網(wǎng)絡采用多路復用技術，幀中的各個時槽被預先分配給不同的終端

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試題8

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試題9

在相隔400Km的兩地間通過電纜以4800b/s的速率傳送3000比特長的數(shù)據(jù)包，從開始發(fā)送到接收完數(shù)據(jù)需要的時間是  ( )  。
A、480ms
B、607ms
C、612ms
D、627ms

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試題10

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