Error detection & correction

Question 1

What is majority voting

Answer 1

A method of checking for errors by producing the same data and confirming its the same each time

Question 2

What are advantages of majority voting

Answer 2

Simple
Efficient
Know errors location

Question 3

What are disadvantages of majority voting

Answer 3

Time
Data
Inefficient
Only detects one error

Question 4

If a message is 10101 what will it be in majority voting? (3)

Answer 4

111000111000111

Question 5

If the majority vote is 1111101110111000 then what is the message? (3)

Answer 5

Error

Question 6

What is a checksum

Answer 6

A small sized datum

Question 6

What is a checksum derived from

Answer 6

A block of digital data

Question 7

What is the purpose of checksum

Answer 7

To detect errors

Question 8

How could errors be introduced

Answer 8

In transportation or in storage

Question 9

What is the purpose of a check digit

Answer 9

To check if the data is accurate

Question 10

What is a check digit

Answer 10

A digit added to the end of a binary string

Question 10

What are the steps of using a check digit

Answer 10

O (original)
W (weighting)
M (multiply)
A (addition)
D (divide 11)
S (subtract 11 - remainder)
Repeat
C (check digit)