题目内容

In the following four descriptions about CSMA/CD, which one is not correct? ( )

An adapter may begin to transmit at any time.
B. An adapter never transmits a frame when it senses that some other adapter is transmitting.
C. A transmitting adapter aborts its transmission as soon as it detects that another adapter is also transmitting.
D. An adapter retransmits when it detects a collision.

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A hub（集线器）is a ( )device that acts on individual bits rather than on frames.

A. physical-layer
B. link-layer
C. network-layer
D. ransport-layer

A switch is a( )device that acts on frame.

A. physical-layer
B. link-layer
C. network-layer
D. ransport-layer

The ability to determine whether a frame should be forwarded to some interface or should just be dropped is ( ).

A. filtering
B. forwarding
C. self-learning
D. optimal routing

Which device has the same collision domain? ( )

A. Hub
B. Switch
C. Router
D. Bridge