Error control in the Data Link Layer is a mechanism used to ensure that transmitted data is transferred accurately and reliably. Error control has the following key functions:
Error Detection
The Data Link layer uses various methods to detect possible errors in transmitted data frames. Errors can occur during the transmission of a data frame due to factors such as electromagnetic interference, physical damage to the cable, or noise. Error detection methods are implemented using special checksums or error detection codes (such as CRC – Cyclic Redundancy Check) added to the frame.
Error Correction
Some Data Link layer protocols can directly correct errors in the transmitted data. Error correction capabilities are especially important in noisy environments, such as wireless communication. These types of protocols can automatically correct the transmitted data on the receiver’s side.
Error Frame Isolation
When an erroneous frame is detected, it is isolated from other data frames, and transmission errors are prevented from affecting other data transmissions.
Error control ensures the reliable transmission of data during network communication. Detecting and, when necessary, correcting errors in data frames makes data transmission more reliable. Therefore, by using error control, the Data Link layer preserves the integrity and accuracy of transmitted data, thereby reducing the risk of data loss or corruption in the network.
