There are many Web pages that provide VPN tutorials. It really depends on what you are looking for. For a high level understanding about VPNs and their applications, a simple Google search (VPN tutorial or VPN introduction) will give you good results. If you want a detailed tutorial with specific protocol understanding, then I would recommend the VPN Consortium's Web page. Here is a link to the white paper section of their Web page:
Dig deeper on Network Access Control
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.