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Layer 2: Data Link

A series of sausages linked together.  Source: Microsoft.

The data link layer sends data frames from the network layer to the physical layer. It is responsible for the control of the signals that enter and leave the network cable. On the receiving end, the data link layer packages raw bits from the physical layer into data frames. The electrical representation of the data (bit patterns, encoding methods, and tokens) is known to this layer only.

Layer 2 PDU: Frame

Next: Layer 1: Physical