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# Network topology

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Network topology: Physical and logical layout of network.
Physical topology: How the cables are used .
Logical topology: How the messages travel

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### Network topology

1. 1. DEPAULS INSTITUTE OF SCIENCE AND TECHNOLOGY , ANGAMALY SCHOOL OF MANAGEMENT SEMINAR “NETWORK TOPOLOGY” PRESENTED BY JENCY P.J NO: 25 29-12-2015 2
2. 2. OUTLINE • INTRODUCTION • NETWORK TOPOLOGY • TYPES OF NETWORK TOPOLOGY • CONCLUSION • REFERNECE 29-12-2015 DiST,Angamaly School of Management 3
3. 3. INTRODUCTION • Network : Interconnection of 2 or more independent computer and peripherals. • Topology : The way in which the computer are interconnected together. 29-12-2015 DiST,Angamaly School of Management 4
4. 4. NETWORK TOPOLOGY • Network topology: Physical and logical layout of network.  Physical topology: How the cables are used . Logical topology: How the messages travel 29-12-2015 DiST,Angamaly School of Management 5
5. 5. TYPES OF NETWORK TOPOLOGY 29-12-2015 DiST,Angamaly School of Management 6 • Bus topology • Ring topology • Star topology • Tree topology
6. 6. BUS TOPOLOGY • A bus topology is multipoint. • All computers and devices connected to central cable or bus. • Here one long cable act as a backbone to link all the devices are connected to the backbone by drop lines and taps. • Drop line- is the connection b/w the devices and the cable. • Tap- is the splitter that cut the main link. 29-12-2015 DiST,Angamaly School of Management 7
7. 7. Cont.…. • It transmits data only in one direction. • Every device is connected to a single cable. • Consists of a main run of cable with a terminator at each end. 29-12-2015 DiST,Angamaly School of Management 8
8. 8. Cont.…. Advantages • It is cost effective. • Cable required is least compared to other network topology. • Used in small networks. • It is easy to understand. • Easy to expand joining two cables together 29-12-2015 DiST,Angamaly School of Management 9
9. 9. Cont.…. Disadvantages • Cables fails then whole network fails. • If network traffic is heavy or nodes are more the performance of the network decreases. • Cable has a limited length. • It is slower than the ring topology. Application • Most computer motherboard. 29-12-2015 DiST,Angamaly School of Management 10
10. 10. RING TOPOLOGY • Cable forms closed ring or loop, with all computers and devices arranged along ring • Here each device has a dedicated connection with two devices on either side. • Data travels from device to device around entire ring, in one direction. • The signal is passed in one direction from device to device until it reaches the destination and each device have repeater. 29-12-2015 DiST,Angamaly School of Management 11
11. 11. Cont.….. • A number of repeaters are used and the transmission is unidirectional. • Date is transferred in a sequential manner that is bit by bit. 29-12-2015 DiST,Angamaly School of Management 12
12. 12. Dual ring topology Advantages • Speed and reliability • Un interrupted long distance communication • Terminators are not required 29-12-2015 DiST,Angamaly School of Management 13
13. 13. Cont.…. Advantages: • Easy to install. • Easy to reconfigure. • Fault identification is easy. Disadvantages: • Unidirectional traffic. • Break in a single ring can break entire network. 29-12-2015 DiST,Angamaly School of Management 14
14. 14. STAR TOPOLOGY • Here each device has a dedicated point-to- point link to the central controller called “Hub” • There is no direct traffic between devices • The transmission are occurred only through the central “hub”. 29-12-2015 DiST,Angamaly School of Management 15
15. 15. Cont.… • Every node has its own dedicated connection to the hub. • Acts as a repeater for data flow. • Can be used with twisted pair, Optical Fibre or coaxial cable. 29-12-2015 DiST,Angamaly School of Management 16
16. 16. Cont.… Advantages • Less expensive • Installation and configuration are easy. • Robustness • Easy to fault identification & to remove parts. • No disruptions to the network then connecting / removing devices 29-12-2015 DiST,Angamaly School of Management 17
17. 17. Cont.… Disadvantages • Even it requires less cabling then mesh when compared with other topologies it still large • Dependency Applications • Star topology used in Local Area Network. • High speed LAN often used STAR. 29-12-2015 DiST,Angamaly School of Management 18
18. 18. TREE TOPOOGY • Alternatively referred to as a star bus topology and hierarchical topology. • A tree topology connects multiple star networks to other star networks. • It has a root node and all other nodes are connected to it forming a hierarchy. • It should at least have three levels to the hierarchy. 29-12-2015 DiST,Angamaly School of Management 19
19. 19. Cont.…. • Ideal if workstations are located in groups. • Used in Wide Area Network. 29-12-2015 DiST,Angamaly School of Management 20
20. 20. Cont.…. Advantages • Extension of bus and star topologies. • Expansion of nodes is possible and easy. • Easily managed and maintained. • Error detection is easily done. 29-12-2015 DiST,Angamaly School of Management 21
21. 21. Cont.…. Disadvantages • Heavily cabled. • Costly. • If more nodes are added maintenance is difficult. • Central hub fails, network fails 29-12-2015 DiST,Angamaly School of Management 22
22. 22. CONCLUSION • Knowledge of networking topologies is of core importance of computer networking design. • which structure or topology is best for which organization or business. • Network Topology brings inherent advantages and disadvantages to any system under study. 29-12-2015 DiST,Angamaly School of Management 23
23. 23. REFERNCE [1]http://www.ijetae.com/files/Volume3Issue1/I JETAE_0113_84.pdf [2] “Computer network and internets” by Douglas E. Comer and M.S Narayanana 29-12-2015 DiST,Angamaly School of Management 24