Western Governors University (WGU) ITEC3201 D413 Telecomm and Wireless Communications Practice Test

The correct choice is Cyclic Redundancy Check (CRC) as it is an error-checking technique that is designed not only to detect errors in transmitted data but also to correct them in some applications. CRC works by performing polynomial division on the data and generating a short, fixed-size check value that represents the data. When the data is sent, the sender computes this check value and adds it to the data. The receiver then performs the same polynomial division on the received data and checks that the computed check value matches the one sent. If they don't match, it's an indication that an error occurred during transmission.

CRC is widely used in telecommunications and computer networks because it can detect multiple types of errors caused by noise in transmission. While it is primarily an error-detection method, certain CRC implementations can also facilitate error correction by indicating the presence of errors and providing enough information to allow for recovery of the original data.

In contrast, other methods such as checksums and parity bits offer only basic error detection and not correction. Checksum sums the values of data units and checks for inconsistencies, while parity bits add only a single bit to indicate whether the number of ones in the data is odd or even. Hashing is used primarily for data integrity verification and