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

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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 pre- venting(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、packets
B、cells
C、message
D、files

答案A

解析

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