2. 计算机
  3. 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

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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