VPN

As the popularity of the Internet grew, businesses turned to it as a means of extending their own networks. First came intranets, which are password-protected sites designed for use only by company employees. Now, many companies are creating their own VPN (virtual private network) to accommodate the needs of remote employees and distant offices.

Basically, a VPN is a private network that uses a public network to connect remote sites or users together. Instead of using a dedicated, real-world connection such as leased line, a VPN uses "virtual" connections routed through the Internet from the company's private network to the remote site or employee. In this article, you will gain a fundamental understanding of VPNs, and learn about basic VPN components, technologies, tunneling and security.

Hackers scan millions of IP addresses daily, looking for open "ports" on computers connected to the Internet.

An organization connects its private network to the Internet for assessing data from others' servers or otherwise called is accessing the internet. While it can access something from others' server then it is the chance that others can access its server.

A firewall keeps separate two networks in exchanging unauthorized data. In this way it protects one network from the other. Usually, a firewall protects the company's private network from the public or shared networks to which it is connected.