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问题 选择题

李明上初中后，突然变得爱美起来，每天早晨起来第一件事就是洗头打摩丝，李明妈妈发现后对他说“李明，你应该把精力放在学习上”。李明回头甩了一句：“你懂什么，这叫酷。”李明的做法说明[ ]

A、李明已长大成熟了

B、李明一定会成为一个与从不同的人

C、李明是个真正独立的人

D、李明没有真正认识到个性的含义

答案

答案：D

单项选择题

在WLAN建设前需求信息的调研与收集中，哪项是不必要的（）

A、对你的组织来说，你需要访问什么内部系统和外部系统

B、公司的组织架构以及经营状况

C、目前你正在使用什么应用软件，这些应用软件存放何处（台式机、服务器、主机）

D、日常工作中，你要求什么样的移动性
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问答题

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 packet 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.

A．reapers

B．relays

C．connectors

D．modems
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