[单项选择]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.
A. collision
B. congestion
C. drop
D. delay

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