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NETWORKING

NETWORKING. NETWORKS. Two or more computers communicating. TELECOMMUNICATIONS. Long distance communications. TOPOLOGY Bus Star Ring. Protocol Polling CSMA/CD Token Ring. LAN Characteristics. MAJOR FUNCTIONS. Make long distance communication seem local

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NETWORKING

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  1. NETWORKING

  2. NETWORKS Two or more computers communicating TELECOMMUNICATIONS Long distance communications

  3. TOPOLOGY Bus Star Ring Protocol Polling CSMA/CD Token Ring LAN Characteristics

  4. MAJOR FUNCTIONS • Make long distance communication seem local • Standardize network interface • Standardize procedures for sending information • Govern error transmission • Govern security • Govern integrity of data

  5. NETWORK COMPONENTS • Computers • Media • Software • Network connections • Satellites • Microwave • stations • Multiplexer – combines many data streams into a single stream

  6. Additional Media Type • Electromagnetic waves • A type of radio wave • Used by satellites • Used by portable computers

  7. MICROWAVE STATIONS Needs a direct sight line SATELLITES

  8. WAN TOPOLOGIES 1. Point to Point 2. Multidrop 3. Mesh 4. Star

  9. Point to Point Direct Connection Between Computers

  10. Advantage No Waiting Disadvantage Expensive to connect Adding new computer

  11. Multidrop Hierarchical Between Concentrator

  12. Advantage No Waiting Direct connections Disadvantage May find delays if going outside the predefined connections Adding new computer

  13. Star Central Point Time Sharing Host

  14. Advantage Centralized control (security) Disadvantage Centralized control (delays)

  15. Mesh Individual Routes Needs a router

  16. Advantage No Waiting Disadvantage Connections (solutions – servers)

  17. Other types of NETWORKS Public access networks (government) VAN – value added network (extra feature – faxes) Private area networks (Sears) Public Data Network (TYMNET)

  18. Wide Area NetworksEnvironments PSTN PSN DDN ISDN DSL

  19. PSTNPublic SwitchTelephone Network

  20. TYPES of Lines • Private • Direct • Expensive • Tie line • Dedicated without the use of the PSTN • Exchanges • Foreign/private • 800 numbers

  21. DDNdata digital network Only transmits DIGITAL information

  22. PSNpacket switching network Sends information in groups called PACKETS

  23. ISDNintegrated servicesdigital network Sends only digital signals Transmits HIGH VOLUME of data Can use the Internet while using the phone line – use of two phone lines

  24. DSLDigital Subscriber Line Translates digital signals to analog Transmits HIGHER VOLUME of data than ISDN Spreads analog signal over a wide range of frequencies

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