Understanding Virtual Private Networks [and why VPNs are important to SD-WAN]

Internet-based virtual private networks rose to popularity in the 1990s by providing cost-effective connections securely across an insecure internet, and along the way VPNs have provided the impetus for today’s SD-WAN technology.

VPN definition

The definition of a virtual private network (VPN) is creating a secure network over network transport that is less secure, such as the internet.

VPNs are used to connect two or more nodes in a network and are most commonly used to connect individual users’ machines to sites or to connect sites to sites. It’s possible to connect users to each other, but the use case for that is very limited so such deployments are rare.

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