Setting up a computer network of computers is very important, but there are many other operations that occur on a daily basis that can include '''trouble-shooting and repairing network connection issues''' and '''maintaining network security'''. System administrators need to '''protect or "harden" their computer networks from "penetration" from unauthorized computer users'''. Hardening a computer system can range from running an '''IDS ''' (Intrusion Detection SystemsSystem) to monitor monitoring and flag flagging suspicious activity to maintaining workstation implementing screen savers to protect sensitive information while staff are away from their office computerson workstations.

In this lab, you will learn how to use the '''ssh''', '''scp''', '''sftp ''' commands to work between computer systems via a network to allow safe sharing of securely access and share data between authorized personnel. In addition, you will learn various methods of running and configuring SSH an ssh server which include: using '''Public Key Authentication''', settings up an '''SSH tunnel ''' in order to securely run graphical application applications safely among computers in your the network, '''disabling root login''', and change '''changing the default ssh communication port for SSH ''' to mislead potential penetration testers (also known as "pen-testers" or "hackers"). and simplify secure network communication by using Public Key Authentication.