Computer Networks
- 1. COMPUTER NETWORKS Jisha Das
- 2. NETWORK 2 or more computers that are linked: to share resources exchange files allow electronic communications
- 3. Computers on a network maybe linked through : Cables Telephone lines Radio waves Satellites Infra red light beams
- 4. TYPES OF NETWORK LAN : is a network that is confined to a small area. WAN : connect larger geographic areas. MAN: connect within a city or metropolis
- 5. Internet : is a network that links hundreds of thousands of networks all over the world, which in turn service individual PC’s or host computers. Intranet : private networks using Internet networking standards and Web technology.
- 6. NETWORK COMPONENTS Hardware Transmission facilities Access devices: Ethernet Card Devices that repeat transmitted signals HUB Software Protocols Device drivers Communication software
- 8. HUB HUB
- 9. USER VIEW OF COMPONENTS Servers Clients Circuit
- 10. TOPOLOGY How computers are connected together. STAR TOPOLOGY RING TOPOLOGY BUS TOPOLOGY
- 11. STAR TOPOLOGY
- 12. BUS TOPOLOGY
- 13. Communication Media Unshielded Twisted Pair (UTP) Cable Coaxial Cable Fiber Optic Cable Wireless
- 14. Wireless Microwave Terrestrial Satellite Radio Infrared Lasers
- 15. Protocols rules that govern the communication process
- 17. Defined by the international standard organisation A set of protocols in a hierarchical order which all std. protocols follow. A reference, not mandatory 7 layers
- 18. PHYSICAL LAYER : nature of & specifications of physical components DATA LINK LAYER : Organizing the data NETWORK LAYER : where to sent the message TRANSPORTATION LAYER : reliable transmission of data PRESENTATION LAYER: user interfaces across different platforms APPLICATION LAYER: sets up standards for applications.
- 19. REFERENCES http://fcit.usf.edu/Network/ http://www.webopedia.com/quick_ref/OSI_Layers.asp www.wikipedia.com Sir’s ppt on NETWORKS