Y10 DSD - Error Detection Assessment

1. Why are Error Detection bits/numbers used?

• To check if a number has been loaded correctly
• To avoid the incorrect item being detected as scanned with a barcode/QR code
• To check if data has been corrupted
• All of the above

2. What would the parity bit be for the ASCII character (binary 1001 001) if odd parity is used?

• 1
• 0
• No parity bid is needed
• 01

3. What is the even parity bit for 1111 1111 1111?

• 0
• 1
• 2
• 3
• 4

Why is data integrity important? Choose all that are applicable.

• To ensure that data is trustworthy.
• To avoid making wrong decisions based on inaccurate data.
• To add more meaning to it.
• To avoid data corruption.
• All of the above

What is parity checking and how does it help in error detection?

• Parity checking helps in error detection by encrypting the data for secure transmission.
• Parity checking helps in error detection by adding an extra bit to each character to make the total number of ones either even or odd.
• Parity checking helps in error detection by counting the number of zeros in each character.
• Parity checking helps in error detection by adding an extra character to the data packet.
• Parity checking helps in error detection by adding a checksum digit to the data.

Explain the concept of even parity and odd parity in data transmission.

• It is used to compress data.
• It is a technique used to improve data transmission speed.
• It is used to encrypt data
• It is used to detect errors in data transmission.

What is the checksum digit for 207720700038:

• 3

• 0

• 6

• 2

• 4

What is the checksum digit for 320121423154

• 10

• 1

• 0

• 9

What is the checksum digit for 677060310043 ?

• 9

• 1

• 0

• 6

Is this barcode correct?

• Yes

• No