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Introduction to Networks & Topologies
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Introduction to Networks & Topologies

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Transcript

  • 1. Networks and Network Topologies A451 – Computing Theory
  • 2. Get your brain logged on…!
    • Think about the following questions:
    • Why do we use networks?
    • What are the alternatives to using networks?
  • 3. By the end of this lesson:
    • All of you will be able to explain why we use networks and how they communicate using data packets .
    • Most of you will be able to explain the difference between a hub , a switch and a router .
    • A few of you will be able to evaluate the Ring , Bus and Star topologies and decide which is the best to use in a given scenario.
  • 4. Data Packets
    • Each packet contains:
    • an address
    • Packet number
    • Error check sum
  • 5. Data Packets Packets can take multiple routes through the network
  • 6. Local Area Network (LAN)
  • 7. Research
    • Use the Internet to find out what each of the following are:
      • Network Hub
      • Network Switch
      • Network Router
    Explore what the differences are between each one.
  • 8. Hub, Switch or Router
    • Hub
      • A hub receives all data sent over the network and sends it to all the other devices on the network.
      • Only the device who the data packet is for will acknowledge it; the other devices will ignore it.
      • Can you see any problems with this?
  • 9. Hub, Switch or Router
    • Switch
      • A switch is bit more intelligent than a hub and it learns which devices are on the network (and their port number/address) and only sends the data packet to the computer who is the intended recipient .
      • How is this better than a hub? HINT: Think about efficiency!
  • 10. Hub, Switch or Router
    • Router
      • A router is cleverer still than both hubs and switches. It can re-direct network traffic and deal with different packets in different ways.
      • It can protect the computers on the network by hiding them from the outside world (i.e. a firewall ).
      • Most modern routers have a modem built-in and wireless capabilities.
  • 11.
    • Get your group into the right positions:
    Ring Topology 2 3 4 5 1
  • 12. Ring Topology
    • RULES OF THE NETWORK
      • The data must be held by at least one computer at all times (any data floating away will be considered a lost packet).
      • Data can only travel one-way in a clockwise direction around the network.
  • 13.
    • Get your group into the right positions:
    Bus Topology 2 3 4 1 Bus
  • 14. Bus Topology
    • RULES OF THE NETWORK
      • The data must be held by at least one computer at all times (any data floating away will be considered a lost packet).
      • Data can only be passed to other computers via the bus .
  • 15.
    • Get your group into the right positions:
    Star Topology 2 3 4 5 1
  • 16. Star Topology
    • RULES OF THE NETWORK
      • The data must be held by at least one computer at all times (any data floating away will be considered a lost packet).
      • Data can only be passed to other computers via the central hub/switch/router .
  • 17. Recap
    • Identify at least one thing you have learned from today’s lesson about networks.
  • 18. Recap
    • All of you will be able to explain why we use networks and how they communicate using data packets .
    • Most of you will be able to explain the difference between a hub , a switch and a router .
    • A few of you will be able to evaluate the Ring , Bus and Star topologies and decide which is the best to use in a given scenario.