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Computer Communications - R D Sivakumar
This document discusses computer communications and networking. It defines computer communications as the transmission of data between computers using connections like telephone lines, microwaves, or radio links. It describes how networking allows large numbers of computers to be interconnected, sharing resources and information. The key elements required for networking are network services using hardware and software, transmission media as the pathway between devices, and protocols which establish communication rules. Examples of network applications include EDI, teleconferencing, banking, reservations, and telemedicine. Benefits of networking include ease of access, sharing, security, and reliability. The main types of networks covered are LANs, MANs, and WANs.
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- 1. COMPUTER COMMUNICATIONS R.D.SIVAKUMAR, M.Sc.,M.Phil.,M.Tech., AssistantProfessor of Computer Science Bell Institute Sivakasi – 626 141. Mobile: 099440-42243 e-mail : rdsivakumarstaff@gmail.com
- 2. COMPUTER COMMUNICATIONS Introduction Computer communicationsis a data can be transmitted one computer to another computer Using telephone, microwaves or radio links.
- 3. Network A large numberof computers are interconnected.
- 4. Importance of networking Sharingof resources Sharing information Communication Computers are connected to other. Messages can be sent and Received.
- 5. Elements in Networking All networks require the following three elements. Network services Network services are provided by numerous combinations of computer hardware and software. Network services require data, input/output resources and Power to accomplish their goal. Transmission media Protocols Transmission media is the pathway for contacting each computer with other. This provides a message delivery path. A protocol can be one rule or a set of rules and standards that allow different devices to hold conversations.
- 6. Applications of Network Electronic Data Interchange (EDI). Tele- conferencing. Financial services, marketing and sales. Reservation of Airlines, trains, theatres and buses. Telemedicine. ATM (Automated Teller Machine). Internet banking.
- 7. Benefits of Network Easyto handle Easy to access Easy to sharing Safe Secure Reliable
- 8. Types of Network LAN– Local Area Network MAN – Metropolitan Area Network WAN – Wide Area Network A local area network (LAN) is a interconnects computers within a limited area such as a home, school, computer laboratory, or office building, using network media. A metropolitan area network (MAN) is larger than a LAN, covering an area of a few city blocks to the area of an entire city, possibly also including the surrounding areas. A wide area network (WAN) covers a broad area that links across metropolitan, regional, national or international boundaries.
- 9. R.D.SIVAKUMAR, M.Sc.,M.Phil.,M.Tech., Assistant Professorof Computer Science Bell Institute Sivakasi – 626 141. Mobile: 099440-42243 e-mail : rdsivakumarstaff@gmail.com