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Network topology


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  • 1. presented by:preeti network topology 1
  • 2. Contents Description of network Description of topology Different types of topology Their advantages and disadvantagespresented by:preeti network topology 2
  • 3. presented by:preeti network topology 3
  • 4. Network In information technology, a network is a series of points or nodes interconnected by communication paths. Networks can interconnect with other networks and contain sub networks.presented by:preeti network topology 4
  • 5. presented by:preeti network topology 5
  • 6. TOPOLOGY Topology defines the physical and logical arrangements of links in a network. Two or more devices connect to a link, two or more link from a topology.presented by:preeti network topology 6
  • 7. In this diagram every system has its separate link to each other device.presented by:preeti network topology 7
  • 9. Mesh Topology In a mesh topology, every device has a dedicated point-to-point link of devices. And the word dedicated means that link carries traffic only between two devices it connects.presented by:preeti network topology 9
  • 10. A fully connected mesh network therefore has n(n-1)/2 physical channels to link n devices. Every device has (n-1) connection in mesh topology.presented by:preeti network topology 10
  • 11. Advantages of Mesh Topology  Dedicated links eliminating the traffic problem.  A mesh topology is robust.  Every system has its own privacy and security.  Point-to-Point make fault identification and isolation is easy.presented by:preeti network topology 11
  • 12. Disadvantages of mesh topology  It is more expensive due to use of more cables.  No proper utilization of systems.  It needs more space or ceiling for dedicated links.presented by:preeti network topology 12
  • 13. STAR TOPOLOGY A star topology has a dedicated point-to-point link only to a central controller, called hub.presented by:preeti network topology 13
  • 14. The hub acts as an exchange between the devices.presented by:preeti network topology 14
  • 15. Advantages of star topology  A star topology is less expensive than mesh topology.  Addition ,deletion and moving of the devices is easy.  Star topology includes robustness.presented by:preeti network topology 15
  • 16. Disadvantages of star topology  Cabling is required in a star.  All devices depends upon the central hub.presented by:preeti network topology 16
  • 17. TREE TOPOLOGY A tree topology is a variation of star. Tree is also linked to a central hub that controls the traffic to the network.presented by:preeti network topology 17
  • 18. The central hub in tree is an active hub & second hub may b active orpassive hub.presented by:preeti network topology 18
  • 19. Advantages of tree topology  The addition of secondary hub is easy.  It allows the network to isolate and prioritize communication between different computers.  Time sensitive data will not have to wait for access to the network.presented by:preeti network topology 19
  • 20. Disadvantages of tree topology  It is more expensive due to cabling.  Increase the distance of the signals  Repeating strengthens transmissions.  The whole connection is depend upon hub , if hub stop its working than the whole network stop the work.presented by:preeti network topology 20
  • 21. Bus topology A bus topology is a multipoint topology. one long cable acts as a backbone to link all the devices in the network. Nodes are connected to the bus cable by drop lines or taps.presented by:preeti network topology 21
  • 22. There is a limit on the number of taps .presented by:preeti network topology 22
  • 23. Advantages of bus topology  In bus topology, backbone can be laid along the most efficient path.  The redundancy is eliminated.  Each drop line has to reach only as far as nearest point of the backbone.  Limited number of taps.presented by:preeti network topology 23
  • 24. Disadvantages of bus topology  Include difficult reconfigurations and fault isolation.  It can be difficult to attach a new device.  Signal reflection at the tap can cause degradation in quality.  A fault or break in the bus cable stops all transmission.presented by:preeti network topology 24
  • 25. Ring topology A ring topology has a dedicated point-to-point line configuration only with the two devices on either side of it.presented by:preeti network topology 25
  • 26. A signal is passed along the ring in one direction, from device to device.presented by:preeti network topology 26
  • 27. Advantages of ring topology  Easy to install and reconfigure.  Add or delete a device require moving only two connections.  Fault isolation is simplified.  Signal is circulating at all times.  An alarm alerts the network operator to the problem and its location.presented by:preeti network topology 27
  • 28. Disadvantages of ring topology  Unidirectional traffic.  A break in ring can disable the entire network.presented by:preeti network topology 28
  • 29. presented by:preeti network topology 29