this s an slide about internet

1. Introduction to IT Session-4

2. Operating System Collection of system programs that together controls the operation of computer system Two objectives: Managing hardware Provides an interactive interface and interprets commands

5. Types of OS Batch processing OS Multi-user or time-sharing Multi-tasking Multi-processor Real-time Industrial Control , telephone switching equipment , flight control , military applications, railway reservation Embedded Household appliances, traffic control systems

6. Functions of OS Process management Memory management File management Device management Security management User interface – CLI & GUI

7. Data Communication Exchange of data between two devices using wired or wireless medium Communication system- collection of hardware and software that facilitate DC Local or remote Components of DC Message Receiver Sender Medium Protocol – set of rules that coordinates the exchange of information

8. Data transmission mode Simplex Half-duplex Walkie-talkie Full-duplex

9. Data transmission Analog Continuous signals Digital Data stored in the form of 0 and 1 Modem Converts digital to analog and vice versa