Lecture 8: Data Link Layer design issues (Framing, Error Control)
Framing is a point-to-point connection between two computers or devices consists of a wire in which data is transmitted as a stream of bits. However, these bits must be framed into discernible blocks of information. Framing is a function of the data link layer.
Error control in data link layer is the process of detecting and correcting data frames that have been corrupted or lost during transmission. Data link layer follows a technique to detect transit errors and take necessary actions, which is retransmission of frames whenever error is detected or frame is lost.