问题
单项选择题
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 (61) between sending the notification and notification arriving at the source, thousands of additional (62) may arrive. In ATM network, a major tool for preventing (63) is (64) control. When a host wants a new virtual (65) , it must describe the traffic to be offered and the service expected.
A．path
B．rout
C．circuit
D．way
答案
参考答案：C
解析： 在低速网络中，网络拥塞经常发生，通过通知包的发送者放慢速度来对此做出反应。在高树甲络中，这种方法通常是不起作用的，因为在发送通知与同志到达这段(61)内，成千上万的额外的(62)可能会来到。在ATM网络中，改善(63)的主要方法是(64)控制。当一个主机想要一个新的虚拟(65)时，它必须描述线路情况和服务的需要。