Introduction to Computer Networks, network requirements and layered architectures. ISO reference model. Data encoding/framing, error detection and correction, DLL protocols (stop wait & sliding windows), Ethernet and FDDI. Network layer and WANs, IP and routing, cell switching and ATM, bridges, internetworking – the global internet. End to End Protocols, UDP, TCP, and RPC. Application layer, security, the domain name system (DNS), and the WWW protocols.