Computer network
- 1. Mrs.S.Chitradevi Assistant Professor in Commerce with CA E.M.G.Yadava Women’s College Madurai-14
- 2. A C o m p u t e r N e t w o r k i s a G ro u p O f C o m p u t e r s l i n k e d t o e a c h o t h e r t h at e n a b l e s t h e C o m p u t e r t o C o mm u n i c at e w it h a n o t h e r C o m p u t e r a n d s h a re t h e i r R e s o u rc e s , D at a , a n d A p p l i c at i o n s . Te l e c o m m u n i c at i o n i s t h e s e n d i n g o f i n fo r m at i o n i n a n y fo r m f ro m o n e p l a c e t o a n o t h e r u s i n g e l e c t ro n i c o r l i g h t e m i t t i n g m e d i a . COMPUTER NETWORKS
- 3. 3 Types of Networks 1) LAN –Local Area Network The Computers are geographically close together (that is, in the same building). 2) WAN – Wide Area Network The Computers are farther apart and are connected by telephone lines o radio waves.
- 4. Characteristics of Networks 4 Topology – The geometric arrangement of a computer. Protocol – Defines a common set of rules and signals that computers on the network use to communicate. Architecture – Peer to peer or Client/Server.
- 6. LAN Network 6 LAN is a network with small area. It is used in a single building or group of building. It can be connected another LAN using telephone lines & radio waves. Most LANs connect workstations & personal computers. LAN comes under different types and they are LAN can transmit data at very fast rate but the distance is limited. Token-ring, Ethernet & ARC nets
- 7. WAN Network 7 Connecting one or more LAN is called WAN
- 9. WAN Network 9 A WAN is a network with large geographical area. Computers connected to WAN use public networks. They can also connected through leased lines or satellites. The Largest WAN in existence is the Internet.
- 11. Star Topology 11
- 12. Star topology 12 It is designed with each node connected directly to a central hub. The hub controls all functions of the network. It act as a repeater for the data. Used to connect one or more small computers.
- 13. Star topology 13 Easy to install and wire. No disruptions to the network. Easy to detect faults and tom remove parts. Requires more cable length. If the hub fails, nodes attached are disabled. More expensive. Advantages Disadvantages
- 14. Ring topology 14
- 15. Ring topology 15 It can be as simple as a circle or point-to-point connections of computers. It has no central hub, all nodes are connected in a closed loop. Access and control of ring networks are maintained by a “token-passing system.
- 16. Ring topology 16 Growth of System has minimal impact on performance. All stations have equal access. Most expensive. Failure of one computer may impact others. Complex. Advantages Disadvantages
- 17. Bus topology 17
- 18. Bus topology 18 It consists of a main run of cable with a terminator at each end. All nodes are connected to the linear cable. All communications are carried on a common cable or bus.
- 19. Bus topology 19 Easy to connect a computer to a linear bus. Requires less cable length than others. Entire network shuts down if there is a break in the main cable. Difficult to identify the problem. Advantages Disadvantages
- 20. Tree topology 20
- 21. Tree topology 21 It combines the characteristics of bus and star topologies. It consist of groups of star configured workstations connected to a linear bus. It allow for the expansion of an existing netwrok.
- 22. Tree topology 22 Point-to-point wiring for individual segments. Supported by several hardware and software vendors. Overall length of each segment is limited by the type of cabling used. If the backbone line breaks, entire segment goes down. Advantages Disadvantages
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