List of Topics: Overview and review of technologies: Goals of Internetworking: Underlying network technologies & characteristics: Packet switching vs. circuit switching: Local, Metropolitan and Wide area networks: Examples of available network hardware Internet Architectural Model: Architectural models Desired properties Gateways and their functions Application-level view Internet Addresses and Address Mapping: Classes of Internet Addresses Internet network and host addresses ARP and RARP protocols Encapsulation Connectionless Datagram Delivery Paradigm: Best-effort (unreliable) delivery and motivation Connectionless protocols The Internet Protocol (IP) Datagram size, fragmentation & encapsulation Time to live Source routing and other options Routing in an Internet: Delivery over a single network Routing through gateways Table-driven routing algorithms Host-specific routes Default routes Type-of-service routing Protocol conversion at gateways Error and Control Messages: Control message semantics and delivery Reachability and error handling Flow control and route change requests Detection and reports of excessively long or circular routes Clock synchronization and time estimation Protocol Layering: Motivation and conceptual model, advantages & disadvantages Internet protocol layering vs. single network protocol layering The layering principle and extension to Internet protocols Layering in the presence of network substructure Reliable Internet Stream Transport: Motivation Providing reliability with acknowledgements and retransmission Retransmission in an Internet vs. a single network Flow control Establishing and breaking connections Out-of-band signalling Destination identification Well-known port numbers & authentification Gateway-to-Gateway Protocols: Notions of autonomous systems Trusted systems and models of trust Routing with partial information Vector and link-status update algorithms Neighbor liveness and reachability tests Delay-based routing vs. minimum hop count routing Transparent Gateways and Subnets: Network and subnet addressing Minimal address assignment Derivation and use of subnet masks Techniques for dynamic addressing including proxy ARP Routing modifications to accommodate subnets Internet Name Server Systems: Importance of name servers Flat and hierarchical name spaces Delegation of authority for names Mapping domain names to addresses Efficient translation and caching Application-Level Internet Services: Remote login, file transfer, electronic mail Integrated text and graphics (Hypertext) Internet delivery paradigm and comparison to other models