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

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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 bytelling 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 offeredand the service expected.

选项 A、packets
B、cells
C、message
D、files

答案A

解析
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