15. What is the purpose of a checksum in data transmission?
a) To encrypt data
b) To verify the integrity of data
c) To compress data
d) To modulate data

16. What happens if the checksum values do not match?
a) Data is considered unaltered
b) Data is considered corrupted
c) Data is considered compressed
d) Data is considered encrypted

17. What is the first step in the checksum creation process on the sender side?
a) Do 1’s complements to the sum
b) Sum all the data blocks
c) Break the original message into blocks
d) Add the carry to the sum

18. What does CRC stand for?
a) Cyclic Redundancy Check
b) Cyclic Repetition Code
c) Code Redundancy Check

d) Check Redundancy Code

19. What is added to the data during the CRC generation process on the sender side?
a) Checksum value
b) Parity bit
c) Extra bits
d) Encryption key

20. What indicates that data may have been corrupted in CRC?
a) If the CRC values match
b) If the CRC values do not match
c) If the checksum values match
d) If the data is encrypted