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Networking for WebMasters

Networking for WebMasters. John MacCulloch UKERNA J.MacCulloch @ ukerna.ac.uk. Web Components. Display. Network. Server. Client. Hypertext Transfer Protocol HTTP. Hypertext InformationBase HTML. Road Rail Telephone National Grid Canal Airline. Old Boy / Old Girl Computer

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Networking for WebMasters

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  1. Networking for WebMasters John MacCulloch UKERNA J.MacCulloch @ ukerna.ac.uk

  2. Web Components Display Network Server Client Hypertext Transfer Protocol HTTP Hypertext InformationBase HTML

  3. Road Rail Telephone National Grid Canal Airline Old Boy / Old Girl Computer Postal Underground Radio / Television Mobile Telephone Typical Networks

  4. What is a Network • Infrastructure which enables computer systems ( and people ) to inter communicate

  5. What is a Network • Infrastructure which enables computer systems ( and people ) to inter communicate

  6. What is a Network • Infrastructure which enables computer systems ( and people ) to inter communicate

  7. What is a Network • Infrastructure which enables computer systems ( and people ) to inter communicate

  8. Network Performance • Bandwidth MBits / Sec • How many bits/sec can be got across the network ( cars / hour over the mororway ) • Latency m Secs • How long from A to B • Jitter m Secs • Variation in Latency

  9. Network Classifications • Size LAN MAN WAN • Access Public Private • Protocol Open Proprietary • Timing Synchronous Asynchronous • Topology Star Ring Bus Tree Mesh • Switching Packet Circuit

  10. Network Size • LAN MAN WAN • Local Metropolitan Wide • Campus City Country

  11. Network Timing • Synchronous • Data bits are timed by a clock pulse • Asynchronous • Data bits are transmitted as required

  12. Asynchronous Under Load Latency Jitter Zero Max Load

  13. Network Topology Ring Star Bus Tree Mesh

  14. Network Switching • Circuit Switching • dedicated connection established between end points which remains in place for the duration of the call • Packet Switching • information packets are individually routed through the network

  15. Ping Traceroute File Transfer Terminal Access Electronic Mail Usenet News Video World Wide Web Network Functions

  16. Example Page • Raw Text 1 K • HTML 2 K • + graphic 40 K • Postscript 100 K • PS ( 300dpi ) 1,000 K

  17. Law’s Law • A picture may be worth a thousand words but a JPEG file takes longer to transmit. • Derek Law, Director of Information Services • and Systems at Kings College

  18. Hints • Look at your site through different eyes • different clients • distant location or simulate low bandwidth • Promote UK based search engines • Note Law’s Law • Use right graphic type ( .gif .jpeg ) • Remember Web is Client Pull

  19. Questions

  20. Networking for WebMasters John MacCulloch UKERNA J.MacCulloch @ ukerna.ac.uk

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