Multiple choice

Bit stuffing refers to

  1. inserting a '0' in user data stream to differentiate it with a flag

  2. inserting a '0' in flag stream to avoid ambiguity

  3. appending a nibble to data stream

  4. appending a nibble to flag stream

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Bit stuffing is used in protocols like HDLC to ensure that a specific flag sequence (e.g., 01111110) does not appear within the actual data payload, preventing the receiver from misinterpreting the end of a frame.