Telecommunication, Network & Internet



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DCN introduction

Network Types

  • By Topology
    • A model that describes how computers are connected
    • A logical model that describes how networks are structured or configured
  • 24

Network Types

  • Structured
    • Ring
    • Bus
    • Star
    • Hierarchical
    • Hybrid
  • Unstructured
    • Mobile Adhoc Network (MANET)

Network Topologies

  • Ring
  • Hierarchical
  • Star
  • Bus
  • 25

Network Topologies

  • For local area networks, not for the Internet
  • Ring
    • A typology that contains computers and computer devices placed in a ring.
  • Bus
    • Computers and computer devices are on a single line. Each device can communicate directly to all devices on the bus.
  • Star
    • All computers are connected via a central hub.

Network Topologies

  • Hierarchical
    • Uses treelike structures with messages passed along the branches of the hierarchy
  • Hybrid
    • A mix of different kinds of structured topologies. It is what exactly the Internet looks like.
  • Mobile Adhoc Network
    • It is unstructured network topology
    • Structure is changing dynamically. EG. Network of mobile phone.

Network Topologies

  • Mobile Adhoc Network
    • Network does not have specify topology
    • Each computer in the network is moving around without locating in a fixed location
    • Sending and receiving messages are difficulty problems

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