Introduction Of Network Topologies

1. Introduction Of Network Topologies

3. Objectives • Describe the basic and hybrid LAN physical topologies, and their uses, advantages and disadvantages • Describe the backbone structures that form the foundation for most LANs

4. Simple Physical Topologies • Physical topology:physical layout of nodes on a network • Three fundamental shapes: • Bus • Ring • Star • May create hybrid topologies • Topology integral to type of network, cabling infrastructure, and transmission media used

5. Bus Network • Advantages :- • Easy to implement and extend • Well suited for temporary networks (quick setup) • Initially less expensive than other topologies • Cheap

6. Bus • Single cable connects all network nodes without intervening connectivity devices • Devices share responsibility for getting data from one point to another • Terminators stop signals after reaching end of wire • Prevent signal bounce • Inexpensive, not very scalable • Difficult to troubleshoot, not fault-tolerant

8. Bus topology

9. Advantages of Bus Topology • Works well for small networks • Relatively inexpensive to implement • Easy to add to it

10. Bus Network -Advantages • Easy to implement and extend • Well suited for temporary networks (quick setup) • Initially less expensive than other topologies • Cheap

11. Disadvantages ofBus Topology • Management costs can be high • Potential for congestion with network traffic

12. Disadvantages • Limited cable length and number of stations. • If there is a problem with the cable, the entire network goes down. • Maintenance costs may be higher in the long run. • Low security (all computers on the bus can see all data transmissions). • One virus in the network will affect all of them (but not as badly as a star or ring network).

13. Ring

14. Simple Physical Topologies • Physical topology • Physical layout of a network • A Bus topology consists of a single cable—called a bus— connecting all nodes on a network without intervening connectivity devices

15. Advantages of Bus Topology • Works well for small networks • Relatively inexpensive to implement • Easy to add to it

16. Disadvantages ofBus Topology • Management costs can be high • Potential for congestion with network traffic

17. Simple Physical Topologies • Ring topology • Each node is connected to the two nearest nodes so the entire network forms a circle • One method for passing data on ring networks is token passing • Active topology • Each workstation transmits data

18. Advantages of Ring Topology • Easier to manage; easier to locate a defective node or cable problem • Well-suited for transmitting signals over long distances on a LAN • Handles high-volume network traffic • Enables reliable communication

19. Ring Network -Advantages • Data is quickly transferred without a ‘bottle neck’. (very fast, all data traffic is in the same direction) • The transmission of data is relatively simple as packets travel in one direction only. • Adding additional nodes has very little impact on bandwidth • It prevents network collisions because of the media access method or architecture required.

20. Disadvantages ofRing Topology • Expensive • Requires more cable and network equipment at the start • Not used as widely as bus topology • Fewer equipment options • Fewer options for expansion to high-speed communication

21. Disadvantages:- • Data packets must pass through every computer between the sender and recipient therefore this makes it slower. • If any of the nodes fail then the ring is broken and data cannot be transmitted successfully. • It is difficult to troubleshoot the ring. • Because all stations are wired together, to add a station you must shut down the network temporarily.

22. Star

23. Simple Physical Topologies • Star topology • Every node on the network is connected through a central device

24. Star (continued) • Any single cable connects only two devices • Cabling problems affect two nodes at most • Requires more cabling than ring or bus networks • More fault-tolerant • Easily moved, isolated, or interconnected with other networks • Scalable • Supports max of 1024 addressable nodes on logical network

25. Advantages of Star Topology • Good option for modern networks • Low startup costs • Easy to manage • Offers opportunities for expansion • Most popular topology in use; wide variety of equipment available

26. Star Network-Advantages • Good performance • easy to set up and to expand. Any non-centralised failure will have very little effect on the network, whereas on

27. Disadvantages ofStar Topology • Hub is a single point of failure • Requires more cable than the bus

28. Disadvantages • Expensive to install • Extra hardware required • About these ads • Share this: • StumbleUponDiggReddit • Loading... • Related

29. Hybrid Physical Topologies: Star-Wired Ring

30. Star-Wired Bus

31. Backbone Networks: Serial Backbone (continued)

32. Distributed Backbone

33. Collapsed Backbone

34. Parallel Backbone

35. THANK YOU..! THANK YOU …..!