Osi Model Questions Medium
Error detection and correction is an important concept in the OSI Model, specifically in the Data Link Layer and the Transport Layer.
In the Data Link Layer, error detection is achieved through the use of a technique called cyclic redundancy check (CRC). CRC involves the sender adding a checksum value to the data being transmitted. This checksum is calculated based on the data bits and is appended to the end of the data frame. Upon receiving the data frame, the receiver recalculates the checksum and compares it with the received checksum. If they match, it indicates that the data has been received without any errors. However, if the checksums do not match, it signifies that errors have occurred during transmission, and the receiver requests the sender to retransmit the data.
In the Transport Layer, error detection and correction are accomplished through the use of sequence numbers and acknowledgments. When data is transmitted from the sender to the receiver, the sender assigns a unique sequence number to each data segment. The receiver acknowledges the receipt of each segment by sending an acknowledgment back to the sender. If the sender does not receive an acknowledgment within a certain time frame, it assumes that the segment was lost or corrupted during transmission and retransmits it. This ensures that all data segments are received correctly and in the correct order.
Overall, error detection and correction mechanisms in the OSI Model help to ensure the integrity and reliability of data transmission, minimizing the impact of errors and ensuring accurate delivery of information.