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问题:

交换机不具有下面哪项功能?A.转发过滤B.回路避免C.路由转发D.地址学习

交换机不具有下面哪项功能?

A.转发过滤

B.回路避免

C.路由转发

D.地址学习


  参考答案

正确答案:C

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A.data
B.byte
C.packet
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A.direct-sequence
B.discrete-sequence
C.duplicate-sequence
D.dedicate-sequence

In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.
Spread spectrum simply means that data is sent in(66)pieces over a number of the discrete frequencies available for use at any time in the specified range. Devices using(67) spread spectrum (DSSS)communicate by splitting each(68)of data into several parts and sending them concurrently on different (69), DSSS uses a lot of the available(70), about 22 megahertz (MHz).
A.small
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C.low
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