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

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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 oRen 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.
(72)

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

答案A

解析

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