题目内容

Describe the layers in the Internet protocol stack from top to down: application layer, layer, layer, layer and physical layer.

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OSI reference model have ____ layers.

Suppose users share a 2 Mbps link. Also suppose each user transmits continuously at 1 Mbps when transmitting, but each user transmits only 20 percent of the time. a. When circuit switching is used, how many users can be supported? ____ users.

Packet switching allows more users to use network than circuit switching.

A. 对
B. 错

There is no difference between a host and an end system.

A. 对
B. 错