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 packe

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

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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 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.
选项 A、path
B、rout
C、circuit
D、way
答案C
解析 在低速的网络里，等拥塞发生了然后再作出响应，通知报文的发送源减缓发送速度就足够了。然而，在高速网络里面，这样的方法常常是没用的，因为在发送通知到通知到报文发送方这段时间里，成千上个更多的报文已经到达了接收方。在ATM网络中，主要的控制拥塞的工具就是控制允许进入网络的报文，当一个主机需要建立一个新的虚电路时，它必须描述将要出现的通信量和期待的服务。
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