Unit 1
Introduction to Computer Networks
Uses of Computer Networks, Network Hardware, Network Software, Network Reference Models, Example Networks – The Internet, Connection-Oriented Networks: X.25, Frame Relay, ATM, Ethernet,
Physical Layer
Guided Transmission Media, Wireless Transmission, Public Switched Telephone Network – Structure of the Telephone System, Local Loop: Modems, ADSL, Multiplexing, Switching.
Data Link Layer (Logical Link layer)
Data link layer design issues: Framing, Error Control, Flow Control.
Error detection and correction, Error-Correcting Codes, Error-Detecting Codes, Data link protocols: Stop-and-Wait protocol, Sliding Window Protocols.