The document outlines the role of an operating system as an intermediary between the user and hardware, detailing its functions such as resource management and security. It also categorizes different types of operating systems, including batch, multiprogramming, and real-time systems. Additionally, it introduces the concept of computer networks, describing various types of networks and devices used for communication.

3.  OS is intermediary between the computer
user and the computer hardware as it
provides a standard user interface that you
see on your computer screen after you switch
on your computer.
 So, although the operating system is itself a
program or software, it allows users to run
other programs or applications on the
system.

4.  Resource/ hardware management
 Process Management
 Storage Management (HD)
 Memory Management (RAM)
 I/O Management
 Security & Privacy

5. 1) Batch Operating System
2) Multiprogramming Operating System
3) Multitasking Operating System
4) Distributed(multiprocess) Operating System
5) Network Operating System:
6) Real-Time Operating System:

11. CPU1 CPU2 CPU3
P1
P2
P3
P4

16.  A computer network is a set of devices
connected through links. A node can be
computer, printer, or any other device
capable of sending or receiving the data. The
links connecting the nodes are known as
communication channels.

17.  LAN(Local Area Network)
 MAN(Metropolitan Area Network)
 WAN(Wide Area Network)

18.  Hub.
 Repeater.
 Bridge.
 Switch.
 Router.
 Gateway.