Swap Space in Linux / RHEL / CENTOS / Fedora

What is a Swap space?

• Swap space is hard disk space that extends system RAM.

Swap space or virtual memory is hard disk space that acts as an extension of system RAM. Of course, due to the relative differential in data access on RAM versus hard disk, we prefer not to use swap space if it can be avoided. Nonetheless, it is vital to the proper functioning of a typical Linux system that some swap space be made available.

what is ethical hacking ?

Ethical hacking is where a person hacks to find weaknesses in a system and then usually patches them. For example, a bank may pay a hacker to hack their systems to see if it is hackable. If he gets in, then they know there is potential for other people to hack in, and usually they will work with this ethical hacker to patch these holes. If he doesn't get in, then they pray that nobody is better at hacking than him.

Let me add this. Hacking is simply exploring a computer's designed features, and learning how to exploit or take advantage of those features. As an example. a computer is designed to load instructions into memory using clearly defined rules, outlined in an RFC that spells out how to load something into memory.