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 signallingThis question was addressed to me during an internship interview.I need to ask this question from Physical Layer in section OSI Model of Computer Network

In asynchronous serial communication the physical layer provides _____

1.	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 signallingThis question was addressed to me during an internship interview.I need to ask this question from Physical Layer in section OSI Model of Computer Network
Answer» The correct option is (C) both start & stop signalling and flow control The best 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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