Network Topologies Michael Lunn Elias Patsalos

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