In low-speed network,it is usually adequate to wait for congestion to occur and then react to it bytelling 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 offeredand the service expected.
(72)处填()。
A.packets
B.cells
C.message
D.files
A.通用性
B.效率
C.质量
D.人一机界面
A.PING
B.TFTP
C.OSPF
D.TELNET
A.对称加密
B.共享密钥加密
C.公开加密
D.密文
A.IEEE
B.ISO
C.IEC
D.CEN
A.获得报酬权
B.使用许可权
C.署名权
D.转让权
A.独占设备
B.共享设备
C.文件
D.主存设备
A.383
B.384
C.385
D.386
A.不求最优,只求满意
B.只求最优
C.求取全部可行解
D.求取全部最优解
A.恰当的标识符
B.适当的注解
C.程序的布局
D.用户手册