Network Topologies Michael Lunn Elias Patsalos


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Network Topologies Michael Lunn Elias Patsalos

  1. 1. Network Topologies Michael Lunn Elias Patsalos James Hardiman
  2. 2. Introduction <ul><li>What is a topology </li></ul><ul><li>Terminology </li></ul><ul><li>Different technologies </li></ul>
  3. 3. Why Network Computers? <ul><li>To share files </li></ul><ul><li>To share hardware </li></ul><ul><li>To share programs </li></ul><ul><li>User communication </li></ul>
  4. 4. Terminology <ul><li>Networking – consists of computers, wiring, and other devices, such as hubs, switches, and routers that make up the network infrastructure. </li></ul><ul><li>Topology – (from the Greek word topos meaning place) is a description of any kind of locality in terms of its layout. </li></ul><ul><li>There are two ways to describe a network topology. </li></ul><ul><li>1. Physical topology </li></ul><ul><li>2. Logical Topology </li></ul>
  5. 5. <ul><li>Client – a computer that allows a user to log onto the network and take advantages of the resources on the network. </li></ul><ul><li>Server – Much more powerful computer that provides centralized administration of the network and serves up the resources that are available on the network. </li></ul>Terminology
  6. 6. Client/Server <ul><li>Client/Server network operating systems allow the network to centralize functions and applications in one or more file servers </li></ul><ul><li>Advantages </li></ul><ul><li>Centralized </li></ul><ul><li>Scalable </li></ul><ul><li>Flexible </li></ul><ul><li>Interoperable </li></ul><ul><li>Accessible </li></ul><ul><li>Disadvantages </li></ul><ul><li>Maintenance </li></ul><ul><li>Expense </li></ul><ul><li>Dependence </li></ul>
  7. 7. Peer to Peer <ul><li>Each computer acts both as a client and server. </li></ul><ul><li>Advantages </li></ul><ul><li>Less expense </li></ul><ul><li>Easy setup </li></ul><ul><li>Decentralized </li></ul><ul><li>Disadvantages </li></ul><ul><li>Security </li></ul><ul><li>Decentralized </li></ul>
  8. 8. Standard Physical Topologies Star Ring Mesh Bus 2223
  9. 9. Bus Topology <ul><li>Characterized by a main trunk or backbone line with networked computers attached at intervals along the trunk line. </li></ul><ul><li>Passive topology </li></ul><ul><li>Typically use coaxial cable hooked to each computer using a T-connector. </li></ul>
  10. 10. Bus Topology cont. <ul><li>Coaxial Cable </li></ul>Connectors
  11. 11. Star Topology <ul><li>Computers on the network connect to a centralized connectivity device, usually a hub or a switch. </li></ul>
  12. 12. Ring Topology <ul><li>Connects the LAN computers one after the other on the wire in a physical circle. </li></ul><ul><li>Moves info on the wire in one direction, considered an active topology. </li></ul>
  13. 13. Mesh Topology <ul><li>All nodes are directly connected with all other nodes. </li></ul><ul><li>Best choice when fault tolerance is required. </li></ul><ul><li>Very difficult to setup and maintain. </li></ul>
  14. 14. Standard Logical Topologies <ul><li>The way in which data accesses the medium (cable) and transmits packets. </li></ul><ul><li>There are only two: Ring and Bus </li></ul>
  15. 15. Logical Topology: Ring <ul><li>In the ring logical topology only one node can send information across the network at any given time. This is done by way of a ‘token’. </li></ul><ul><li>Each terminal receives this special packet, and if it has data to send, it will do so. </li></ul><ul><li>Once it has sent the data, it passes the token to the next station. </li></ul><ul><li>Used for very fast networks </li></ul><ul><li>No collisions </li></ul><ul><li>Susceptible to faults </li></ul>
  16. 16. Logical Topology: Bus <ul><li>Each time a node on a network has data for another node the sending node broadcasts to the entire network. </li></ul><ul><li>Stations can always transmit. </li></ul><ul><li>Less susceptible to breaks. </li></ul><ul><li>Collisions (two stations transmitting at once) have to be dealt with. </li></ul>
  17. 17. Selecting a Topology <ul><li>Needs: </li></ul><ul><li>Do you need very high speeds? </li></ul><ul><li>Will you be moving really large files? </li></ul>Maintenance: Do you want something (relatively) painless? Cost: Are you on a budget? Do you want replacement parts easily accessible? Geography: How far is it between stations? Will you be relocating stations often?
  18. 18. Thank you! <ul><li>Questions? </li></ul>