题目内容

Which of the following four descriptions about random access protocol is not correct? ( )

A transmission node transmits at the full rate of the channel
B. When a collision happens, each node involved in the collision retransmits at once.
C. Both slotted ALOHA and CSMA/CD are random access protocols.
D. With random access protocol, there may be empty slots.

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Which of the following four descriptions about random access protocol is not correct? ( )

A transmission node transmits at the full rate of the channel B. When a collision happens, each node involved in the collision retransmits at once. C. Both slotted ALOHA and CSMA/CD are random access protocols. D. With random access protocol, there may be empty slots.

Which of the following is wrong? ( )

The ( )field permits Ethernet to multiplex network-layer protocols.

An entry in the switch table contains the following information excepts for ( )

意义相同或相近的词的相关语义组成的语义场叫做（），义场中的各个词叫做（）。

A transmission node transmits at the full rate of the channel
B. When a collision happens, each node involved in the collision retransmits at once.
C. Both slotted ALOHA and CSMA/CD are random access protocols.
D. With random access protocol, there may be empty slots.