Topic: Computer Networks
Which of the following methods is used to detect double errors?
- A. Odd Parity
- B. Even Parity
- C. Checksum (CRC)
- D. Checksum (XOR)
Answer: C. Checksum (CRC)
Explanation: Simple parity (odd or even) can only detect an odd number of bit errors and fails to detect double bit errors. Cyclic Redundancy Check (CRC) is a robust method capable of detecting double errors as well as burst errors.