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2 years ago

What is an Operating System ??

Computers and Technology

1 answer:

NikAS [45]2 years ago

3 0

Hi Pupil Here's Your Answer :::

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An operating system is a system software, that after being initially loaded into the computer by a good program, manages all the other programs in a computer.

The application programs make use of the operating system by making request for services through a different Application Program Interface (API). In addition, users can interact directly with operating systems through a user interface such as command language or Graphical User Interface(GUI).

Functions Performed by the OS :

♤ The operating system acts as an interface between the computer hardware and the user.

♤ It manages computer's memory.

♤ It handles interrupts.

♤ It schedules the jobs.

♤ It manages Input/Output devices.

All major computer platforms (hardware and software) required and sometimes include an Operating System. Linux, Windows, Mac, VMS, OS/400 X, and z/OS are examples of operating systems.

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Hope this helps ........ ☺☺

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rewona [7]

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3 years ago

QUESTION 6 Which of the following is a class A IPv4 address? a. 118.20.210.254 b. 183.16.17.30 c. 215.16.17.30 d. 255.255.0.0

shepuryov [24]

Answer:

a. 118.20.210.254

Explanation:

Here are the few characteristics of Class A:

First bit of the first octet of class A is 0.

This class has 8 bits for network and 24 bits for hosts.

The default sub-net mask for class A IP address is 255.0.0.0

Lets see if the first bit of first octet of 118.20.210.254 address is 0.

118 in binary (8 bits) can be represented as : 1110110

To complete 8 bits add a 0 to the left.

01110110

First bit of the first octet of class A is 0 So this is class A address.

For option b the first octet is : 183 in the form of bits = 10110111 So it is not class A address

For option c the first octet is 215 in the form of bits = 11010111 So it is not class A address

For option d the first octet is 255 in the form of bits = 11111111. The first bit of first octet is not 0 so it is also not class A address.

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