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

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.