Downloaded 44 times
More Related Content
Computer networks
- 1. Computer Networks Prepared By P.SUDARMANI,M.SC.M.PHIL., ASSISTANTPROFESSOR IN COMPUTER SCIENCE P.Sudarmani,M.sc,M.Phil.,Assistant Professor 04/08/2020
- 2. P. Sudarmani, M.Sc,M.phil.,Assistant Professor 09/07/2020
- 3. Introduction Computer network: Acomputer network is a collection of computers and devices connected together via communication devices and transmission media. Devices- printers, scanner Communication devices NIC HUB Router Transmission media Physical Infrared Radio wave Satellite P.Sudarmani,M.sc,M.Phil., Assistant Professor 09/07/2020
- 4.
- 5. Internet Workstation Cable modem Router server switch printer Printserver P.Sudarmani,M.sc,M.Phil., Assistant Professor 09/07/2020
- 6. Advantages of ComputerNetworks: P.Sudarmani,M.sc,M.Phil., Assistant Professor 09/07/2020
- 7.
- 8. LAN Types of computer Network ComputerNetwork MAN WAN Network Architecture Network topologies Network Communication technologies Star Peer to Peer Client/Server Ring Bus Intranet Ethernet Internet P.Sudarmani,M.sc,M.Phil., Assistant Professor 09/07/2020
- 9. There are twotypes of transmission technology: 1. Broadcast Networks ➢This has a single communication channel that is shared by all the machines on the network. ➢The data transmitted is converted in small packets form. Each packet contains address field of the destination station. ➢Ex:- a person standing at corridor “watson, come here. I want you” ➢sending same packets to all the stations within a network is called as broadcasting. ➢When data packets are sent to a specific group of stations it is called as multicasting. This is a selective process P.Sudarmani,M.sc,M.Phil., Assistant Professor 09/07/2020
- 10. 2. Point-to-point Network Point-to-pointconnections use an actual length of wire or cable to connect the two ends, but other options, such as microwave or satellite links, are also possible. When you change television channels by infrared remote control, you are establishing a point-to- point connection between the remote control and the television's control system. This network provides a dedicated link between any two stations . Such a transmission is called unicasting. P.Sudarmani,M.sc,M.Phil., Assistant Professor 09/07/2020
- 11.
- 12.
- 13.
- 14.
- 15.
- 16. Home Network Applications 1.Access to remote information • Many people pay their bills, manage bank accounts, handle their investments electronically. • Home shopping. • On-line newspaper which can be personalized. • Access to information system like world wide web, which contains information about arts,business,cooking,government,health,history,science,sports,travel,…….. • All the above applications involve in interactions between a person and remote database. 2. Person-to-person communication • Electronic mail or email which allow users to communicate with no delay • Videoconference- which makes possible 3. Interactive entertainment Huge and growing industry,Video,Game playing 4. Electronic commerce Electronic Commerce, commonly known as E- commerce or ecommerce, is trading in products or services using computer networks, such as the Internet E-commerce facilitates home shopping, catalogue of company products. P.Sudarmani,M.sc,M.Phil., Assistant Professor 09/07/2020
- 17. Wireless Wireless networks arecomputer networks that are not connected by cables of any kind. The use of a wireless network enables enterprises to avoid the costly process of introducing cables into buildings or as a connection between different equipment locations. The basis of wireless systems are radio waves, an implementation that takes place at the physical level of network structure. P.Sudarmani,M.Sc,M.Phil.,Assistant Professor 09/07/2020 Wireless networks use radio waves to connect devices such as laptops to the Internet, the business network and applications. When laptops are connected to Wi-Fi hot spots in public places, the connection is established to that business’s wireless network.
- 18. On a networkbuilt using the client-server architecture, the devices communicate to other devices through a central computer referred to as a server. The server is a terminal with high processing power, which provides services for the other computers on the network. P.Sudarmani,M.sc,M.Phil., Assistant Professor 09/07/2020
- 19. On a networkbuilt using the peer-to-peer architecture, no specific distinction exists between a client and a server. Any node can provide a service as well as send a request for a service from another node on the network. P.Sudarmani,M.sc,M.Phil., Assistant Professor 09/07/2020
- 20. NetworkSoftware The first computerdesigned with the hardware as the major concern and the software as an afterthought. This no longer works. Network software is now highly structured. • Protocol Hierarchies • Design Issues for the Layers • Connection-Oriented and Connectionless Services • Service Primitives • The Relationship of Services to Protocols P.Sudarmani,M.sc,M.Phil., Assistant Professor 09/07/2020
- 21. Reference Models • TheOSI Reference Model • The TCP/IP Reference Model P.Sudarmani,M.sc,M.Phil., Assistant Professor 09/07/2020
- 22.
- 23. THE SEVEN OSIREFERENCE MODEL LAYERS P.Sudarmani,M.sc,M.Phil., Assistant Professor 09/07/2020
- 24.