单项选择题

案例分析题

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.

（）are also part of the Frame Relay specification.

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