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Framing techniques

Câu hỏi 1: Bit stuffing

Bit stuffing. Consider a simple protocol that uses 16 bits frames. Bit stuffing can be used to recover the frames from a string of bits. The table below shows an original frame (before bit stuffing) and a transmitted frame (after having applied bit stuffing). Only one of the lines below corresponds to a valid utilisation of bit stuffing (the frame boundary marker is 01111110). Which one ?

Câu hỏi 2: Character stuffing
Character stuffing is another framing technique. It uses the DLE, STX and ETX characters. The table below shows original (before stuffing) and transmitted frames (after stuffing). Only one of the proposed answers is valid. Which one ?