试题1

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试题4

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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试题10

一个局域网中某台主机的IP地址为176.68.160.12，使用22位作为网络地址，那么该局域网的子网掩码为 （1） ，最多可以连接的主机数为 （2） 。
（1）A、255.255.255.0
B、255.255.248.0
C、255.255.252.0
D、255.255.0.0
（2）A、254
B、512
C、1022
D、1024

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