Objectives
In this chapter you will learn
To define the full scope of Linux security
To identify and implement additional aspects of password security
To use the firewalld firewall to manage access to the host on SSH and Telnet ports
To install and configure the Telnet server
To use tcpdump to monitor the plain text data of a Telnet conversation
To enable the SSHD server and use tcpdump to verify that the conversation is encrypted
To describe PAM authentication
To install and configure Fail2Ban dynamic firewall software to block attacks
To take some basic steps to improve security of any Linux host
