Discussion
Error detection at the data link layer is achieved by
Answer: B
Error detection at the data link layer is done with Cyclic redundancy codes.
The sender divides the frame's bits by a fixed generator polynomial and appends the remainder as the frame check sequence. The receiver repeats the division; a non-zero remainder means the frame was corrupted. Ethernet uses a 32-bit CRC this way.
Bit stuffing is used for framing, to keep the flag pattern out of the data. Hamming codes are designed to correct errors rather than just detect them, and are used mainly in memory. Equalization is a physical-layer technique for distorted signals.
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