The unit of transfer at the link layer is a phit and the unit transfer at the physical layer is a flit.

Name: The unit of transfer at the link layer is a phit and the unit transfer at the physical layer is a flit.
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Quizplus · Accepted Answer

The unit of transfer at the link layer is usually a frame, while at the physical layer, it's usually a bit or a symbol. Flit (FLow control unIT) is a term sometimes used in networking to refer to a unit of data at the transport layer of the network stack, not the physical layer.

The Unit of Transfer at the Link Layer Is a Phit