As an organization at this time connecting their systems via enterprise-wide networks and VPNs as well as increase their exposure to customers, competitors, browsers and hackers on the Internet, become increasingly important for Web professionals to be trained in techniques for effectively protecting their sites from internal and external threat. With increased connectivity to the Internet and the availability of automated cracking of tools, organizations can no longer simply rely on operating system security to protect valuable data of their company. In addition, the use of Web technology exploded for corporate intranet and Internet sites have increased the risk of corporate data security and information systems. Practical Internet Security reveals how the Internet is paving the way for secure communications within organizations and the public Internet.