Operating System (OS): OS is the term that acts as an interface between the hardware and the user. It is the first program loaded into the computer memory whenever the computer starts up. It is responsible for the management and co-ordination of activities on a computer system. It is the most important program that runs on a computer is operating system. OS does basic operations such as getting input from the keyboard, displaying output in the monitor and monitoring the files. OS controls the peripheral devices like printers, hard drives and mouse. The responsibilities of OS are bound to get higher when it comes to security, because it provides the access rights for users.

Question

If a UDP datagram is sent from host A, port P to host B, port Q, but at host B there is no process listening to port Q, then B is to send back an ICMP Port Unreachable message to A. Like all ICMP messages, this is addressed to A as a whole, not to port P on A. (a) Give an example of when an application might want to receive such ICMP messages. (b) Find out what an application has to do, on the operating system of your choice, to receive such messages. (c) Why might it not be a good idea to send such messages directly back to the originating port P on A?

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Chapter 9, Problem 2PS

Program Plan Intro

Operating System (OS):

OS is the term that acts as an interface between the hardware and the user.

It is the first program loaded into the computer memory whenever the computer starts up.

It is responsible for the management and co-ordination of activities on a computer system.

It is the most important program that runs on a computer is operating system.

OS does basic operations such as getting input from the keyboard, displaying output in the monitor and monitoring the files.

OS controls the peripheral devices like printers, hard drives and mouse.

The responsibilities of OS are bound to get higher when it comes to security, because it provides the access rights for users.

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