Video lecture on Data link services in Computer networks by Dr D Sivakumar , Professor and Head, CSE

This video lecture explains the essential services provided by the Data Link Layer in computer networks, focusing on how this layer ensures reliable and efficient communication between directly connected devices. Key topics covered include: Framing: How data is divided into manageable frames for transmission. Error Detection and Correction: Techniques like parity, CRC, and checksum that ensure data integrity. Flow Control: Methods such as stop-and-wait and sliding window to prevent sender–receiver mismatch. Reliable Delivery: Ensuring that frames reach the destination without loss or duplication. Media Access Control: How devices share and access the communication channel. This lecture gives learners a clear understanding of how the Data Link Layer supports smooth and secure data transmission in network communication.