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What is a site-to-site VPN?

A site-to-site VPN is a VPN that connects multiple networks together

What is TCP/IP and what is it used for?

TCP/IP is transfer protocol/internet protocol and it is used to organize data according to packets

What are some popular reasons for using a VPN?

Some popular reason for using a VPN are: to mask your ip address, to look at geolocked content, and to protect yourself from cyber attacks in public places

Explain the difference between the three types of VPNs.

Remote access VPN is connected remotely and is relayed. Intranet site-to-site VPN is a VPN that connects multiple local area networks. Extranet based site-to-site is mainly used between two companies that can collaborate and share info without any outsiders being able to get in.

Source: What is a Site-to-Site VPN?

What I would like to know more about

I would like to know more about how to set up a VPN as I feel like that kind of knowledge in an enterprise environment would be very beneficial.