OSI Layering: Data Link Layer

Example: A wants to send two frames to B.

A: sends data frame 0.

B: receives data frame 0, discovers bad checksum.

B to A: retransmit 0. A to B: sends data frame 1.

A: sends data frame 0. B: receives data frame 1 and asks A to send the correct frame.

A: sends data frame 0. B: receives data frame 0.

A: sends data frame 1.

B: receives data frame 1.

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