GATE CS 2014 Set 3 — Question 34

MCQ+1 / -0.33MediumFramingData Link LayerComputer Networks

Computer Networks → Data Link Layer → Framing

Last updated 5 September 2026

Question

A bit-stuffing based framing protocol uses an 8-bit delimiter pattern of 01111110. If the output bit-string after stuffing is 01111100101, then the input bit-string is

Correct answer (B) 0111110101 Solution The delimiter is 01111110 . In bit stuffing, a 0 is inserted after every five consecutive 1 s in the data to prevent the delimiter pattern from appearing in the payload. Received string: 01111100101 Scanning the string: We see 011111 (five consecutive 1s). The next bit is 0 . This 0 was stuffed by the sender. We remove this stuffed 0 . Resulting string: 011111 + 0101 = 0111110101 Turn this into a strength. Explore AI-powered practice and doubt support with Success Tracker.

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Correct answer (B) 0111110101 Solution The delimiter is 01111110 . In bit stuffing, a 0 is inserted after every five consecutive 1 s in the data to prevent the delimiter pattern from appearing in the payload. Received string: 01111100101 Scanning the string: We see 011111 (five consecutive 1s). The next bit is 0 . This 0 was stuffed by the sender. We remove this stuffed 0 . Resulting string: 011111 + 0101 = 0111110101

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