The purpose of this paper is to give you a brief and basic overview of what to look for when starting out in penetration testing and to build up an internal penetration test kit to aid you in performing both internal and external penetration tests on your company network. To also make you aware of the problems with new network technology like wireless networks, and remote access devices that can circumvent network perimeter security devices like firewalls and IDS.  Whilst also showing you the pit falls of security, and the need to check all systems for vulnerabilities and to carry out regular patching and monitoring of all systems within your network.  This paper also lists suggested well known security penetration tools for both Linux and Windows operating systems.