HDLC Framing, 25 points: The HDLC protocol uses a flag 01111110 at the start and end of frames. In order to prevent data bits from being confused with flags, the sender stuffs a zero after every 5 consecutive ones in the data. We want to understand the effect of the following three modifications. For each modification, assume that all other parts of the framing protocol remain unchanged.
- Will the framing rules work if we change the stuffing rule to stuff a zero only after 6 consecutive ones? Explain.
- Will the protocol work if we change the stuffing rule to stuff a 0 only after a zero followed by 5 consecutive ones? Explain.
- Will the protocol work if we change the stuffing rule to stuff a 1 only after a zero followed by 6 consecutive ones? Explain.
- The protocol does work if we change the stuffing rule to stuff a zero after 4 consecutive ones. Explain why this is inferior to the HDLC rule.