In a communication system, which among the following convert messages into packets that can travel across the communication channel?
A. Connection devices
B. Sending and receiving devices
C. Storage devices
D. Secondary devices
查看答案
Which physical connection is the fastest?
A. Twisted pair
B. Coaxial cable
C. Fiber-optic cable
D. Microwave
Which among the following is considered a line-of-sight communication medium?
A. Broadcast radio
B. Satellite
C. Bluetooth
D. Microwave
WiMax stands for _______.
A. Wide-area Access for Maximum Reach
B. Wide-area Range to Maximize Access
C. Worldwide Interoperability for Microwave Access
D. Worldwide Access to Maximize Interoperability
Microwave communication uses high-frequency _______.
A. radio waves
B. infrared
C. satellite communications
D. optic fibers
微信支付 
支付宝支付