2. 计算机
  3. Frame Relay is simplified form of(71),similar in principle to(72), in which synchronous, frames of data are routed to different

Frame Relay is simplified form of(71),similar in principle to(72), in which synchronous, frames of data are routed to different

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问题 Frame Relay is simplified form of(71),similar in principle to(72), 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(73). Most Virtual Circuits are(74),which means that the network provider sets up all DLCI connections at subscription time.(75)are also part of the Frame Relay specification. They privide a link that only lasts only as long as the session.
选项 A、Permanent Circuits
B、Permanent Virtual Circuits
C、Switched Virtual Circuits
D、Switched Circuits
答案C
解析 帧中继是分组交换方式的一种，原理上与X.25相似。根据DLCI(数据链路连接标识符)域分组路由通过一个或者更多的虚电路。大部分虚电路是永久性虚电路PVC，意思就是网络提供者预先建立的所有DLCI连接。交换式虚电路是帧中继标准的一种。它们根据一次会话提供一个连接。
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