Introduction to a VPN

A VPN is a technology that allows two or more locations to communicate securely over a public network while maintaining the security and privacy of a private network. Encryption, authentication, and packet integrity checks are key enablers of VPNs; they ensure that the data is private and the integrity of the data is maintained. The main reason for using VPNs is that private networks are expensive to acquire and maintain. Companies are finding VPNs a cost-effective way to connect sites to one another.

Given that firewalls are designed to be the gatekeepers between public and private networks, it makes sense to integrate VPN capabilities into a firewall. You can not only filter traffic but also subject VPN usage to a security ...

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