In low - speed network ,it is usually adequate to wait for congestion to occur and then react to it by telling the source of pac

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问题 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(71)between sending the notification and notification arriving at the source, thousands of additional(72)may arrive. In ATM network , a major tool for preventing(73)is(74)control.  When a host wants a new virtual(75),it must describe the traffic to be offered and the service expected.

选项 A、collision
B、congestion
C、drop
D、delay

答案B

解析 congestion:阻塞
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