题目内容
Frame Relay is simplified form of (1) , similar in principle to (2) , 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 (3) Most Virtual Circuits are (4) , which means that the network provider sets up all DLCI connections at subscription time. (5) are also part of the Frame Relay specification. They privide a link that only lasts only as long as the session. 1()
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