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、collision
B、congestion
C、drop
D、delay

答案B

解析

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