Error Detection and Correction Quiz

What is the purpose of a parity bit?

• To locate where an error occurred

• To correct an error in data

• To check if an error occurred during transmission

• To compress the data

Which error detection method checks both rows and columns in a data block?

• Checksum

• Echo check

• Parity block

• ARQ

In even parity, the number of 1s in a byte including the parity bit must be:

• Always 8

• An even number

• An odd number

• Zero

What is the main disadvantage of an echo check?

• It only works with wired transmissions

• It is too fast to be reliable

• Errors can happen during the return transmission

• It cannot detect any type of error

Which of the following is an example of a check digit algorithm?

• Symmetric encryption

• ISBN number validation

• SHA-2 hashing

• Diffie-Hellman exchange

What does asymmetric encryption use?

• Only a public key

• One shared key

• A public key and a private key

• No keys at all

What is the purpose of the SHA-2 algorithm?

• To compress data

• To create secure hash keys

• To decrypt ciphertext

• To check parity

Which encryption method poses a key distribution problem?

• Asymmetric

• Check digit

• Symmetric

• ARQ

Explain how an automatic repeat request (ARQ) works to ensure data is received correctly.

Describe how a checksum is calculated and used to detect errors.