試題1

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試題2

某網(wǎng)絡工程計劃圖如下所示，邊上的標記為任務編碼及其需要的完成時間（天），則整個工程的工期為 （ ） 。

A、16
B、17
C、18
D、21

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試題3

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試題4

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試題5

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試題6

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試題7

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試題8

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試題9

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10

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