Network Security
In the past, information security was a term used to describe the physical security measures used to keep vital government or business information from being accessed by the public and to protect it against alteration or destruction. This was done by storing valuable documents in locked filing cabinets or safes and restricting physical access to areas where those documents were kept. With the proliferation of computers and electronic media, the old way of accessing data changed. As technology continued to advance, computer systems were interconnected to form computer networks, allowing systems to share resources, including data. The ultimate computer network, which interconnects almost every publicly accessible computer network, is the Internet. Although the methods of securing data have changed dramatically, the concept of network security remains the same as that of information security.
Because computers can warehouse, retrieve, and process tremendous amounts of data, they are used in nearly every facet of our lives. Computers, networks, and the Internet are an integral part of many businesses. Our dependence on computers continues to increase as businesses and individuals become more comfortable with technology and as technology advances make systems more user-friendly and easier to interconnect.

A single computer system requires automated tools to protect data on that system from users who have local system access. A computer system that is on a network (a distributed system) requires that the data on that system be protected not only from local access but also from unauthorized remote access and from interception or alteration of data during transmission between systems.
Threats
Types of Attacks
Network Security Policy
AVVID and SAFE

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