Chapter 4

Question 1

What is packet

Answer 1

Packet is a generic term that refers to small block of data.

Question 2

What are 2 reasons for packet

Answer 2

1. Resource sharing

2. To detect the errors

Question 3

What is frame

Answer 3

A frame is a digital data transmission unit in computer networking and telecommunication. A frame typically includes frame synchronization features consisting of a sequence of bits and symbols that indicate to the receiver, the beginning, and end of the payload data

Question 4

What are frame delimiters

Answer 4

The characters at the start and end of frame

Question 5

What is SOH character

Answer 5

Start of header

Question 6

What is EOT character

Answer 6

End of transmission

Question 7

What are disadvantages of frame

Answer 7

Incurs extra overhead. EOT and SOH take time but carry no data

Question 8

What are advantages of frame

Answer 8

Missing EOT or SOH will be identified and system will know something is wrong.

Question 9

What is data stuffing

Answer 9

Sometimes the special character (i.e. soh or eot) used as part of data. Data stuffing is its solution. We replace special character eot/soh with some one else in it.

Question 10

What is byte stuffing and bit stuffing

Answer 10

Byte stuffing is done on character oriented hardware and bit stuffing is done on bit oriented hardware.