What is the primary responsibility of the Data Link Layer?

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Accepted Answer

Error detection and correction - The Data Link Layer is the second layer in the OSI model. Its main job is to make sure data is sent correctly from one device to another over the same network segment.

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.

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