Which type of architecture places a firewall in front of the VPN to protect it from Internet-based attacks as well as behind a firewall to protect the internal network?

DMZ-based.

Explanation:

VPN or virtual private network, as the name implies, is a network virtually extending a private network over a public network or the internet, to provide secure access to users that can not physical access the actual private network.

Delimitarized zone DMZ is an isolated point between an internal or private network and the internet, configured to provide access to untrusted or unauthorized users. The DMZ- based VPN is a virtual private network with two firewalls securing the internet and private network end, but provides access to users.

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