Network topology
- 2. Topologies…Topologies… 1) Mesh Topology 2) Bus Topology 3) Ring Topology 4) Star Topology 5) Tree Topology 2
- 3. Mesh TopologyMesh Topology It is point to point connection. The use of dedicated links guarantees that each connection can carry its own data load, thus eliminating the traffic problems that can occur when links must be shared by multiple devices. 3
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- 5. Advantages of Mesh topologyAdvantages of Mesh topology 1. It is robust. i.e. one link becomes unusable, it does not affect to the entire system. 2. It is Secured. i.e. when every message travels along a dedicated line, only particular recipient can sees it. 3. It is easy to fault identification and fault Isolation. 5
- 6. Disadvantages of Mesh topologyDisadvantages of Mesh topology 1. It required large amount of cabling and I/O ports, because every device must be connected to every other device. 2. Installation and reconnection are difficult. 3. It is expensive .because number of hardware required to connect each link(I/O ports and cables) 4. For these reason a mesh topology is usually implemented in a limited fashion. 6
- 7. Bus topologyBus topology All networked nodes are interconnected, peer to peer, using a single, open-ended cable Both ends of the bus must be terminated with a terminating resistor to prevent signal bounce 7
- 9. Advantages of Bus topologyAdvantages of Bus topology 1) Easy to implement and extend 2) Backbone cable can be laid along the most efficient path, then connected to the drop line of various length. 3) A bus uses less cabling than mesh and star topology. 4) Well suited for temporary networks that must be set up in a hurry 5) Typically the least cheapest topology to implement 9
- 10. Cont…Cont… Failure of one station does not affect others 10
- 11. Disadvantages of Bus topologyDisadvantages of Bus topology 1) Difficult to reconnection and fault isolation. 2) Limited cable length and number of stations 3) A cable break can stop the entire network. 4) Maintenance costs may be higher in the long run 5) Performance degrades(loss) as additional computers are added 11
- 12. Ring topologyRing topology started out as a simple peer-to-peer LAN topology Each networked workstation had two connections: one to each of its nearest neighbors Data was transmitted unidirectional around the ring Sending and receiving of data takes place by the help of TOKEN 12
- 13. Token PassingToken Passing Token contains a piece of information which along with data is sent by the source computer This token then passes to next node, which checks if the signal is intended to it If yes, it receives it and passes the empty to into the network otherwise passes token along with the data to next node 13
- 15. Advantages of Ring topologyAdvantages of Ring topology 1) This type of network topology is very organized 2) Performance is better than that of Bus topology 3) No need for network server to control the connectivity between workstations 4) Additional components do not affect the performance of network 5) Each computer has equal access to resources 15
- 16. Disadvantages of Ring topologyDisadvantages of Ring topology 1) Each packet of data must pass through all the computers between source and destination, slower than star topology 2) If one workstation or port goes down, the entire network gets affected 3) Network is highly dependent on the wire which connects different components 16
- 17. Star topologyStar topology Each device has connected point to point link only to a central controller called a hub or switch The controller acts as an exchange , if one device wants to send data to another, it sends the data to the controller the relays the data to the particular device. Each networked device in star topology can access the media independently 17
- 19. Advantages of star topologyAdvantages of star topology 1) Compared to Bus topology it gives far much better performance 2) Easy to connect new nodes or devices 3) Centralized management. It helps in monitoring the network 4) Failure of one node or link doesn’t affect the rest of network 19
- 20. Disadvantages of star topologyDisadvantages of star topology 1) If central device fails whole network goes down 2) The use of hub, a router or a switch as central device increases the overall cost of the network 3) Performance and as well number of nodes which can be added in such topology is depended on capacity of central device 20
- 21. Tree TopologyTree Topology A tree topology combines characteristics of linear bus and star topology. It consist of group of star configured workstation connected to a linear bus backbone cables. Tree topology allow for expansion of an existing network. 21
- 22. Advantages of tree TopologyAdvantages of tree Topology 1. Expansion of Network is possible and easy. 2. Here, we divide the whole network into segments (star networks), which can be easily managed and maintained. 3. Error detection and correction is easy. 4. Each segment is provided with dedicated point-to-point wiring to the central 22
- 23. Continue…Continue… 5. If one segment is damaged, other segment are not affected. 23
- 24. Disadvantages of tree topologyDisadvantages of tree topology 1.Because of its basic structure, tree topology, relies heavily on the main bus cable, if it breaks whole network is crippled. 2.As more and more nodes and segments are added, the maintenance becomes difficult. 3. Scalability of the network depends on the type of cable used. 24
- 25. Thank You…! 25