根据下面的文字资料回答 63~67 题In low－speed network,it is usually adequate to wait for co

根据下面的文字资料回答 63～67 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 oftenworks poorly，because in the（ 1 ）between sending the

notification and notification arriving at the source，thousands of

additional（ 2 ）may aITive．In ATM network，a major tool for

preventing（ 3 ）is（ 4 ）control．when a host wants a new virtual（ 5 ），it must

describe the traffic to be offered and the service expected．

第63题：文中（ 1 ）处正确的答案是（ ）。

A．interval

B．time

C．slot

D．delay