Frame Relay is simplified form of () ,similar in principle to () , in which synchronous, frames of data are routed to different destinations depending on header information. Packets are routed throught one or more Virtual Circuits known as () . Most Virtual Circuits are () ,which means that the network provider sets up all DLCI connections at subscription time. () are also part of the Frame Relay specification. They privide a link that only lasts only as long as the session.
Frame Relay is simplified form of ()
A.Datagram Switching
B.Datagram Routing
C.Packet Switching
D.Packet Routing
A.运算器和控制器
B.累加器和控制器
C.运算器和寄存器组
D.运算和控制系统
A.集线器
B.交换机
C.路由器
D.网桥