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G52CCN Computer Communications and Networks

Learn about the basic principles of data communications and computer networks, including network technologies and Internet protocols. Explore topics such as addressing, routing, error detection, and server-client interactions.

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G52CCN Computer Communications and Networks

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  1. G52CCNComputer Communications and Networks Milena Radenkovic Room: B47 Email: mvr@cs.nott.ac.uk

  2. Introduction • Practical matters • Module goals, structure and contents • Initial introduction to some key ideas and issues

  3. Lectures • Thursday 15:00 – 16:00 • Jubilee Campus, Exchange Building, LT2 • Friday 09:00 – 10:00 • Jubilee Campus, Exchange Building, LT2

  4. Related modules • G53ACC - Advanced Computer Communications • G5BIAW - The Internet and the World Wide Web

  5. Objectives • To understand the basic principles of data communications and computer networks. • To appreciate the complex trade-offs that are inherent in the design of networks. • To provide a guided tour of network technologies from the lowest levels of data transmission up to network applications. • To learn about current networking technologies, especially Internet protocols.

  6. Assessment • Two hour written examination • The style of question will be based upon those from previous years. Their content will of course be different. • Last year’s exam paper is on sale in the bookshop and previous papers are in the library. • No coursework

  7. Text books and notes • My notes are available at: • http://www.cs.nott.ac.uk/~mvr/ccn • The core recommended course text is: • Computer Networks and Internets, Douglas E. Comer, Prentice Hall • Supplementary texts are: • Tannenbaum, Computer Networks, Prentice Hall • Halsall, Data and Computer Communications, Macmillan

  8. What is a computer network? • An interconnection of autonomous computers (as opposed to communication between separate but interdependent parts of a single computer)

  9. Some goals of computer networks • Access to remote resources • Human communication • Mobile computing • Computing power through parallelism • Optimising resources - load balancing • Incremental growth of computer systems (reduced cost and risk) • Increased robustness through graceful degradation

  10. Uses of computer networks • Email, World Wide Web, Video Conferencing, File Transfer, Collaborative Virtual Environments, Remote control of robots and machines, Dial up databases, Webcasting, Distributed Programs, Hacking, Banking, Internet telephone

  11. Classifying networks • By size • Local area networks (LANs) versus Wide area networks (WANs) • By connectivity • Point to point versus broadcast networks • By communication medium • By mobility • Fixed versus mobile

  12. Size - differences between local and wide area networks • ‘Speed’ - bandwidth and latency • Management • Security • Reliability • Billing • Heterogeneity (and standards)

  13. Connectivity - point to point networks tree star irregular mesh

  14. Connectivity - broadcast networks wire satellite/radio

  15. Medium - differences between communication media • ‘Speed’ - bandwidth and latency • Range • Sharing • Topology • Installation and maintenance costs • Reliability

  16. Mobility - issues arising in mobile networks • Mobile networking has emerged in the last decade. Introduces new issues of: • energy efficiency • location and tracking • semi-persistent connections • complex administration and billing as devices and users move around the network

  17. Common issues in networking • Addressing • Routing • Framing and encoding • Error detection and correction • Flow and congestion

  18. Module contents and structure Part 4: applications Part 3: internetworking Part 2: packet transmission Part 1: data transmission

  19. Part 1: data transmission • Transmission media; • Local asynchronous communication (RS-232); • Long distance communication (modems and carriers)

  20. Part 2: packet transmission • Packets, frames and error detection • Local area networks (LANs) • Hardware addressing • LAN wiring and physical topology • Extending LANS: Fiber Modems, repeaters, bridges and switches; • WAN Technologies and routing • Network ownership and service paradigm • Protocols and layering

  21. Part 3: internetworking • Concepts, architecture and protocols • IP addresses • Binding protocol addresses (ARP) • IP Datagrams and datagram forwarding • IP encapsulations, fragmentation and reassembly • The future of IP • An error reporting mechanism (ICMP) • TCP (reliable transport service)

  22. Part 4: Applications and Security • Client-server interaction • The socket interface • Example applications

  23. Next Lecture: • Local Ansynchronous Communication and RS-232

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