Network security has become much more complex than ever before. New types and sources of network security threats, always-on high-speed Internet connections, wireless networking, and much more sophisticated methods of attacking networks have made network security both more difficult to manage and more essential in today's technological environment. In a nutshell, the job of network security is to ensure that people who need access to the network and its data can have that access whenever they need it, while denying access to anyone who is not authorized. This report will address the a Network, Network Security, Network Security Key, Firewall Settings, Secure a Wireless Network, Secure Network Devices and the advantage , disadvantage of remote disk tup .