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.
(75)

选项 A、path
B、rout
C、circuit
D、way

答案C

解析 当拥塞发生时,便通告信源要放慢速度,在低速网络中,等待通告时间通常是足够的。但在高速网络中,这种方法工作起来有时会很差,这是因为,在发出通告与通告到达信源这段时间内(interval),可能又有成千上万个数据包(packets)已经到达。在ATM网络中,主要的拥塞(congestion)避免工具是通信量(traffic)控制。当一台主机想建立一条新的虚电路(circuit)时,必需要描述其通信量和服务要求。
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