What is the primary responsibility of the Data Link Layer?

It does this by performing error detection and correction. This means the layer checks for mistakes that might happen during transmission and corrects simple errors before the data moves up to higher layers.

What else the Data Link Layer does:

• Breaks data into frames for sending


• Adds headers and trailers with error-checking information


• Ensures correct delivery over physical media like Ethernet or Wi-Fi


• Uses MAC (Media Access Control) addresses to send data between devices on the same local network

Tip: If you’re asked about which layer handles errors or uses MAC addresses, the correct answer is always the Data Link Layer.

Conclusion: The Data Link Layer’s primary responsibility is error detection and correction, ensuring reliable communication across a local network.