[单项选择]SDLC was invented by IBM to replace the older Bisynchronous protocol for wide area connections between IBM equipment. A varietion of the (71) protocol called NRM is essentially the same as SDLC. SDLC is (72) protocol like HDLC, Frame Relay or X.25.An SDLC network is made up of (73) that controls all communications, and (74) . It is capable of (75) operation, but almost all practical applications are strictly half duplex.

A. HDLC
B. Frame Relay
C. X.25
D. X.21

更多"SDLC was invented by IBM to replace"的相关试题:

[单项选择]SDLC was invented by IBM to replace the older Bisynchronous protocol for wide area connections between IBM equipment. A varietion of the (71) protocol called NRM is essentially the same as SDLC. SDLC is (72) protocol like HDLC, Frame Relay or X.25.An SDLC network is made up of (73) that controls all communications, and (74) . It is capable of (75) operation, but almost all practical applications are strictly half duplex.

A. a peer to peer
B. a point-to-point
C. not a peer to peer
D. a peer to peers

查看答案

[填空题]Young children look _____ the older ones, so older children should be good examples.

查看答案

[简答题]

[问题1]
用100字以内文字，分析使张工放弃采用传统的SDLC方法的原因。

查看答案

[单项选择]SDLC、HDLC和LLC都是在OSI模型的 (16) 卫上层上操作的协议。传输层的功能是 (17) 。会话层的功能是 (18) 。邮件服务和目录服务是通过 (19) 提供给用户的。X.25协议属 OSI (20) 上的操作。

A. 数据链路层
B. 网络层
C. 会话层
D. 表示层

查看答案

[单项选择]

SDLC是 (1) 层的协议，无连接的服务是 (2) 层的服务，网桥是用于 (3) 层的设备；面向连接的服务是 (4) 层的服务，用于电子邮件的协议是 (5) 。

3（）
A. 物理层
B. 数据链路层
C. 网络层
D. 高层

查看答案

我来回答:

提交