Which of the following is a set of rules designed to force the devices sharing a channel to observe orderly communications procedures?
A. Framing
B. Public data network
C. Handshaking
D. Protocol
Question 2
___________ occurs when calls are unable to reach their destination as a result of excess demand for system capacity.
A. Delay distortion
B. Switching
C. Congestion
D. Attenuation distortion