Did you wonder what the Linux operating system is and how you can install it on your system? Do you want to learn how to separate the Linux operating system from the main operating system used? Have you been trying to learn how to perform penetration testing or other ethical hacking processes to determine the security of the server or network? If you answered yes to these questions, then you have come to the right place. Linux is an operating system used by system administrators and hackers to manage the server or network's security. You can use the operating system to address business demands, including network administration, system administration, and database management. In this book, you will learn more about the different techniques to help you protect the system from a security breach and how you can protect the files and data you have on your system. In this book, you will first learn about how you can use Linux on virtual machines. You will also learn about the different tools you can use to harden the network and server's security. You will learn about the different permissions and accesses and how you can use it to enhance the security of setting the security. You will also learn about how you can perform a penetration test, or an ethical hack, to scan the system and see what you can do to improve the settings. Over the course of this book, you will discover how to: ¿ Installing Linux on your system and accessing it using a virtual machine ¿ Secure user accounts using passwords and ACLs ¿ Secure the server using a firewall and other methods ¿ Learn to decrypt and encrypt data sent over the network ¿ Explore various methods to prevent hackers from accessing information in your system ¿ Perform tests to identify any vulnerabilities in the network and server, and more!