2.2 Methods of error detections

Question 1

Why do errors occur?

Answer 1

Errors can occur during data transmission due to
interference, e.g. data loss, data gain and data
change

Question 2

What is Parity check?

Answer 2

A type of error detection method that adds an additional bite each byte to create a odd or even sum.

Question 3

What is Checksum?

Answer 3

A type of error detection method that performs a calculation on data to create a checksum value. Checksum values are compared after transition to see if they match

Question 4

What is Echo check?

Answer 4

a type of error detection method that sends a copy of the transmitted data back to the sender to be compared with the original data sent

Question 5

What does ARQ stand for?

Answer 5

Automatic repeat request

Question 6

What is ARQ?

Answer 6

A type of error detection method that uses acknowledgement and timeout to see if data has arrived correctly after transmission

Question 7

What is acknowledgement?

Answer 7

a message that is sent from one device to another to indicate whether data is received correctly

Question 8

What is timeout?

Answer 8

a period of time that i set and used to wait for an acknowledgement to be received

Question 9

What is Check Digit?

Answer 9

a type of error detection method that is used for a data entry. A calculation is performed on the data entered to create a value. Check digit values are compared to see if the data entered is correct