What is the data unit at the Data Link Layer called?

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Accepted Answer

Frame - In the OSI model, each layer has a specific name for the data it handles. At the Data Link Layer, the data unit is called a Frame.

The Data Link Layer takes packets from the Network Layer and wraps them with headers and trailers to form a frame. These headers and trailers help with error checking and device addressing using MAC addresses.

Important points about Frames:

A frame contains data along with error-checking bits (like CRC)
It uses MAC addresses to send data from one local device to another
It is only used within the same local network segment (LAN)
Frames are passed to the Physical Layer as bits for transmission


Tip: If asked about what a "frame" is or where it’s used, say it’s the data format used by the Data Link Layer for local transmission.

Conclusion: The data unit at the Data Link Layer is called a Frame, and it ensures reliable delivery of data within a local network.

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