超星 - 自测题 ch5

单选题

In the Ethernet frame structure, the Data field carries the ( ).

A. IP datagram
B. segment
C. frame
D. message

单选题

In the following four descriptions, which one is not correct? ( )

A. Ethernet uses baseband transmission.
B. All of the Ethernet technologies provide connection-oriented reliable service to the network layer.
C. The Ethernet 10Base2 technology uses a thin coaxial cable for the bus.
D. The Ethernet 10BaseT technology uses a star topology.

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单选题

Ethernet’s multiple access protocol is ( ).

A. CDMA
B. CSMA/CD
C. slotted ALOHA
D. token-passing protocol

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单选题

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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单选题