TestOut LabSim A+ Certification Practice Exam

What is an error detection technique that can also correct the error?

1. Paraty check

2. Checksum

3. ECC

4. CRC

The correct answer is: ECC

Error detection techniques are crucial in ensuring the integrity of data during transmission or storage. Among the choices, Error-Correcting Code (ECC) stands out as a method that not only detects errors but also has the capability to correct them. ECC utilizes specific algorithms to add extra bits—known as redundancy—to the data that allow for the identification and correction of errors that may occur. The redundancy in ECC is structured so that, even if bits are altered during transmission, the system can recognize these changes and attempt to revert them to their original state. This attribute makes ECC particularly valuable in environments where data integrity is paramount, such as in computer memory, and it enhances reliability in data communication. Other techniques like parity check, checksum, and CRC (Cyclic Redundancy Check) are primarily focused on error detection. While they can identify that an error has occurred, they do not inherently provide mechanisms for correcting these errors. Thus, they may signal an issue, but cannot restore the original data without additional information or protocols. Hence, ECC is distinguished as a robust solution that meets both the detection and correction needs in error management.