(72)

(73)

(74)

(72)

(71)

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.

(68)

(69)

(66)

公钥密码是(39)。常用的公钥加密算法有(40)，它可以实现加密和数字签名，它的一个比较知名的应用是(41)，这种应用的协商层用公钥方式进行身份认证，记录层涉及到对应用程序提供的信息的分段、压缩、数据认证和加密。

一般来说，Cache的功能(13)。某32位计算机的Cache容量为16KB，Cache块的大小为16B，若主存与Cache的地址映射采用直接映射方式，则主存地址为1234E8F8(十六进制)的单元装入的Cache地址为(14)。在下列Cache替换算法中，平均命中率最高的是(15)。