Introduction to computer networks
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The document provides an overview of computer networks, including definitions of Local Area Network (LAN), Metropolitan Area Network (MAN), and Wide Area Network (WAN). It discusses various network topologies such as bus, star, ring, and mesh, highlighting their characteristics and applications. Additionally, it outlines key components of networking, including devices, media, and protocols, emphasizing the importance of client-server architecture and various applications like e-commerce and internet telephony.
Introduction to computer networks
- 1. INTRODUCTION TO COMPUTER NETWORKS Presented by: Haider Ali Malik University of Sargodha
- 2. INTRODUCTION TO COMPUTER NETWORKS Introduction to Computer Networks
- 3. Computer Networks Computer network connects two or more autonomous computers. The computers can be geographically located anywhere. Introduction to Computer Networks
- 4. LAN, MAN & WAN Network in small geographical Area (Room, Building or a Campus) is called LAN (Local Area Network) Network in a City is called MAN (Metropolitan Area Network) Network spread geographically (Country or across Globe) is called WAN (Wide Area Network) Introduction to Computer Networks
- 5. Applications of Networks Resource Sharing • Hardware (computing resources, disks, printers) • Software (applicatio n software) Informati on Sharing • Easy accessibilit y from anywhere (files, databases) • Search Capability (WWW) Communi cation • Email • Message broadcast Remote computing Distributed processing (GRID Computing) Introduction to Computer Networks
- 6. Network Topology The network topology defines the way in which computers, printers, and other devices are connected. A network topology describes the layout of the wire and devices as well as the paths used by data transmissions. Introduction to Computer Networks
- 7. Bus Topology Commonly referred to as a linear bus, all the devices on a bus topology are connected by one single cable. Introduction to Computer Networks
- 8. Star & Tree Topology The star topology is the most commonly used architecture in Ethernet LANs. When installed, the star topology resembles spokes in a bicycle wheel. Larger networks use the extended star topology also called tree topology. When used with network devices that filter frames or packets, like bridges, switches, and routers, this topology significantly reduces the traffic on the wires by sending packets only to the wires of the destination host. Introduction to Computer Networks
- 9. Ring Topology A frame travels around the ring, stopping at each node. If a node wants to transmit data, it adds the data as well as the destination address to the frame. The frame then continues around the ring until it finds the destination node, which takes the data out of the frame. Single ring – All the devices on the network share a single cable Dual ring – The dual ring topology allows data to be sent in both directions. Introduction to Computer Networks
- 10. Mesh Topology The mesh topology connects all devices (nodes) to each other for redundancy and fault tolerance. It is used in WANs to interconnect LANs and for mission critical networks like those used by banks and financial institutions. Implementing the mesh topology is expensive and difficult. Introduction to Computer Networks
- 11. Network Components Physical Media Interconnecting Devices Computers Networking Software Applications Introduction to Computer Networks
- 12. Networking Media Networking media can be defined simply as the means by which signals (data) are sent from one computer to another (either by cable or wireless means). Introduction to Computer Networks
- 13. Networking Devices HUB Switches Routers Wireless Access Points Modems etc. Introduction to Computer Networks
- 14. Computers: Clients and Servers In a client/server network arrangement, network services are located in a dedicated computer whose only function is to respond to the requests of clients. The server contains the file, print, application, security, and other services in a central computer that is continuously available to respond to client requests. Introduction to Computer Networks
- 15. Networking Protocol: TCP/IP Introduction to Computer Networks
- 16. Applications Searchable Data (Web Sites) E-Commerce News Groups Internet Telephony (VoIP) Video Conferencing Chat Groups Instant Messengers Internet Radio E-mail Introduction to Computer Networks