Introduction to Computer Network
Download as PPTX, PDF2 likes2,811 views
This document discusses data transmission and computer networks. It defines data transmission as the transfer of digital data over communication channels and telecommunication as communication at a distance using technology. A computer network allows devices to exchange data by connecting them with cables, routers/switches, wireless access points, network cards, modems and an internet connection. Networks can be local area networks within a building, wide area networks connecting multiple LANs over large distances, or metropolitan area networks that are hybrids between LANs and WANs. The advantages of networks include file sharing, resource sharing, communication and flexible access.
Introduction to Computer Network
- 1. Understanding the Basic Principles of Data Transmission
- 2. Objectives • Define data transmission • Explain the term telecommunication • State different methods of data transmission • Define Computer Network • State types of Network • State advantages of Network • Identify equipment necessary for data transmission • Understanding Communication Software
- 3. Data Transmission & Telecommunication Data Transmission is the physical transfer of data (a digital bit stream) over a point-to-point or point-to-multipoint communication channel. Telecommunication is communication at a distance by technological means, particularly through electrical signals or electromagnetic waves.
- 4. Computer Network • A computer network or data network is a telecommunications network that allows computers to exchange data. In computer networks, networked computing devices pass data to each other along data connections. • A computer network connects together all your computers, plus other peripheral equipment like printers. To build a computer network you will need a range of physical equipment including the following pieces of network hardware in the following slides.
- 5. Equipments Necessary for Data Transmission • Cables and connectors. These link together the computers, printers, servers and other equipment on your network.
- 6. Equipments Necessary for Data Transmission • A router or switch. This manages network traffic, ensuring devices can communicate with each other.
- 7. Equipments Necessary for Data Transmission • A wireless access point. This allows people to connect to the network wirelessly.
- 8. Network card is an electronic device that connects a computer to a computer network, usually a LAN or WLAN. It is considered a piece of computer hardware.
- 9. Equipments Necessary for Data Transmission • An internet connection. This could be a simple broadband connection over a telephone line or a faster fibre connection. • A hardware firewall. This creates a secure barrier between your network and the internet, blocking security threats.
- 10. Equipments Necessary for Data Transmission Modem: A modem (modulator-demodulator) is a device that modulates an analog carrier signal to encode digital information and demodulates the signal to decode the transmitted information.
- 11. Types of Computer Network • Local area networks (LANs) are used to connect networking devices that are in a very close geographic area, such as a floor of a building, a building itself, or a campus environment. • Wide area networks (WANs) are used to connect LANs together. Typically, WANs are used when the LANs that must be connected are separated by a large distance. • A metropolitan area network (MAN) is a hybrid between a LAN and a WAN.
- 12. Advantages of Computer Network • File Sharing • Software Cost and Management • Security • Resource Sharing • Communication • Flexible Access • Workgroup Computing
- 13. Communication Software • Communication software is used to provide remote access to systems and exchange files and messages in text, audio and/or video formats between different computers or users. • Communication software forms a part of communication systems with software components classified according to functions within the Open Systems Interconnection Model (OSI Model). Some examples of communication software are file transfer protocol (FTP), messaging software and email such as Internet Message Access Protocol (IMAP) or Post Office Protocol (POP), Voice Over Internet Protocol (VoIP) and the internet protocol suite which is Transmission Control Protocol (TCP) and the Internet Protocol (IP).