HDLC (High-level Data Link Control) is a group of protocols for transmitting dat
ID: 3750257 • Letter: H
Question
HDLC (High-level Data Link Control) is a group of protocols for transmitting data nodes. In HDLC, each message starts and ends with the unique flag sequence of 01111110. To prevent this flag sequence from occurring in other parts of the message, a process known as zero bit insertion, or bit stuffing is used Draw a diagram to show how zero bit insertion is used when transmitting the following 5 message data bytes. a2 (9 marks) Q3 There are four types of characteristics attributed to a flow: reliability, delay, jitter, and bandwidth. Explain how each of these is related to Quality of Service. (8 marks)Explanation / Answer
Q2: Bit stuffing in HDLC(High-Level Data Link Control Protocol)
in HDLC each frame begins and ends with a special bit pattern called a flag byte [01111110].
Data is of variable length inside the frame and use bit stuffing( insert 0 after 5 consecutive 1's)
Given 5 Byte input data is
01110011 11110111 01111110 01001101 11111100
After Bit stuffing (Stuffed input data)
0111001111101011101111101001001101111101100
Stuffed zero bits is shown in bold
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