[单项选择]
In low - speed network ,it is usually adequate to wait for congestion to occur and then react to it by telling the source of packets to slow down. In high - speed networks, this approach often works poorly, because in the （1） between sending the notification and notification arriving at the source, thousands of additional （2） may arrive. In ATM network , a major tool for preventing （3） is （4） control. When a host wants a new virtual （5） ,it must describe the traffic to be offered and the service expected.
（1）处应选择（）
A. interval
B. time
C. slot
D. delay

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[单项选择]

In low - speed network ,it is usually adequate to wait for congestion to occur and then react to it by telling the source of packets to slow down. In high - speed networks, this approach often works poorly, because in the （1） between sending the notification and notification arriving at the source, thousands of additional （2） may arrive. In ATM network , a major tool for preventing （3） is （4） control. When a host wants a new virtual （5） ,it must describe the traffic to be offered and the service expected.

（2）处应选择（）
A. packets
B. cells
C. message
D. files

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[单项选择]In low-speed network, it is usually adequate to wait for congestion to occur and then react to it by telling the source of packets to slow down. In high-speed networks, this approach often works poorly, because in the (61) between sending the notification and notification arriving at the source, thousands of additional (62) may arrive. In ATM network, a major tool for preventing (63) is (64) control. When a host wants a new virtual (65) , it must describe the traffic to be offered and the service expected.

A. interval
B. time
C. slot
D. delay

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