信息系统项目管理师教程第3版PSTN接入真题习题

Circuit-switching technology is used in Publish Switched Telephone Network(PSTN), Global System for Mobile Communications(GSM) and code Division Multiple Access (CMDA) . It is a ( ) information transfer mode.
A. connection oriented
B. connectionless
C. high bandwidth utilization
D.poor real-time
参考答案：A 点击查看更多>>

信息系统项目管理师教程第3版PSTN接入考点