What are the asynchronous protocolsin data link layer?

Asynchronous protocol in data link layer is defined as the protocol which works with single characters  or byte and not in the form of blocks of data.

Explanation: Data link layer has the asynchronous protocol which deals with single byte or character at a time rather than working in block order for the data.the data is transferred from one node to another node in individual byte or character and it is observed that the data bytes that are sent is received in the same form .

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