Question: 9. (6 pts) The link layer (layer 2) usually performs error detection (e.g., using cyclic redundancy codes and attaching checksums at the end of frames).

9. (6 pts) The link layer (layer 2) usually performs error

9. (6 pts) The link layer (layer 2) usually performs error detection (e.g., using cyclic redundancy codes and attaching checksums at the end of frames). However, TCP (layer 4) also performs error detection, placing checksums in TCP headers. If error detection is done at layer 2, why is it needed at layer 4? 10. (4 points) Why does the link layer place checksums in the trailer of a frame, rather than in the header

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