computer network basic to be understand clearly
- 1. Module I 1
- 2. Overall Organization of the Course 1. How do two directly connected machines communicate reliably? 2. How can a link be shared between more than two machines? 3. Building networks 1. LAN and interconnecting LANs – communication over small geographical area 2. WANs –reliable communication over wide geographical area, when no direct link exists between all machines 4. How we can send data so accurately in distant places? 2
- 3. INTRODUCTION ● Definition: A n/w is a set of devices connected by communication links.(Device nodes & nodes can be a computer, printer, or any other device capable of sending &/or receiving data generated by other nodes on the network. ) ●Networks are an interconnection of two or more computers such that they can share resources and information. ●These computers can be linked together using a wide variety of ●Cables ●Or telephone lines ●or through satellites. 3
- 4. What is a Network? ●A collection of machines/devices that communicate with each other over some communication medium ●Two machines may be directly connected, or can communicate through other machines ●Some machines are sources and destinations of data ●Some devices do not generate data, but facilitate in the transfer (ex. a router) 4
- 5. Data Communications ● Data Communications: are the exchange of data b/w two devices via some form of transmission medium such as a wire cable. ● For data communications to occur, the communicating devices must be part of a communication system made up of a combination of hardware & software. ● Effectiveness of a data communication depends on: delivery (system must deliver data to the correct destination) accuracy (system must deliver data accurately) timelines (system must deliver data in a timely manner) jitter (refers to the variation in the packet arrival time) 5
- 6. Components of Data Communication Network 6 Five components are there: Message Sender Receiver Transmission Medium Protocols
- 7. Contd.. 7