Q.

In asynchronous serial communication the physical layer provides                        

A. start and stop signalling
B. flow control
C. both start & stop signalling and flow control
D. only start signalling
Answer» C. both start & stop signalling and flow control
Explanation: in asynchronous serial communication, the communication is not synchronized by clock signal. instead of a start and stop signaling and flow control method is followed. unlike asynchronous serial communication, in synchronous serial communication a clock signal is used for communication, so the start and stop method is not really required.
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