WHAT ARE NETWORK TOPOLOGIES?

Topology

A network topology defines the way in which the computers, printers and other devices are connected.The topology plays an important role in computer networks

Physical vs logical topologies

A physical topology is how they are actually connected with wires and cables whereas a logical topology is how devices appear to be connected to the user.

Types of Topologies

Bus Topology-In this the devices are connected by a single cable which runs throughout the network.

Advantages

  • It works well for small networks
  • Use less cable than other physical topologies
  • easy to add new networks
  • inexpensive to install

Disadvantage

  • if backbone breaks the whole network is down
  • only limited no of devices can be included
  • sharing the same cable slows down the access time
  • difficult to isolate the problem

Ring Topology-In these devices are connected in a form of ring or circle.In this data flows in ring from device to device

Types

  • Single ring-Date flows only in one direction either clockwise or anticlockwise
  • Dual ring-Data flows in two directions

Advantages

  • There is no collision
  • Data packets can be travel at high speed
  • no terminations are needed
  • it is easier to locate problems with device or cable

Disadvantage

  • requires more cable than bus network
  • a break in the cable will bring down many devices
  • when adding new devices to ring, all devices are suspended from using the network

Star topology-In this network device are connected in a star shape.In this, there is the central hub to which many devices are connected.

Advantage

  • easy to add more devices to the network
  • The failure of one cable will not  break down the entire network
  • The hub provides centralized management
  • it is easy to find device and cable problem

Disadvantage

  • The failure of one central hub breaks down the entire network
  • require more media than a ring or bus network
  • cost of installation and equipment are higher than for most of the bus networks

Mesh topology– In this each device is connected to every other device.

Advantage

  • A mesh network offers improved fault tolerance if part of system goes down

Disadvantage

  • expensive and difficult to install
  • difficult to manage
  • difficult to troubleshoot

Hybrid topology– When two or more topologies are combined in a single network it is known as hybrid topology

 

 

 

One thought on “WHAT ARE NETWORK TOPOLOGIES?

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