In the OSI model, which layer is responsible for detecting errors caused during physical transmission?
Explanation
In the OSI (Open Systems Interconnection) model, the Data Link Layer (Layer 2) is primarily responsible for node-to-node data transfer and ensuring that the physical transmission is error-free. It uses mechanisms like Cyclical Redundancy Check (CRC) or checksums to detect errors that occur during the transmission of bits over the physical medium.
While we can describe the error detection process logic, let T be the transmitted frame and R be the received frame. Error detection typically involves a function f such that:
f(T)=Checksum(T)
If the received frame R is processed, the Data Link Layer verifies:
f(R)=?Checksum(T)
If the equality does not hold, the layer identifies that an error has occurred during transmission.
