A network engineer must use an Internet connection to provide backup connectivity between two sites. The backup connection must be encrypted and support multicast.
Which technology must be used?
A. GETVPN
B. IPsec direct encapsulation
C. DMVPN
D. GRE over IPsec
I believe D is the correct answer.
D
https://www.linkedin.com/pulse/cisco-site-to-site-vpn-technologies-comparison-mate-gulic/