I'm thinking this question should be: what is NOT a commonality?
IS-IS routing is not a commonality.
Both FlexVPN and DMVPN are compatible with IKEv2, both use NHRP, and they can use the same hashing algorithms.
The key is necessity.
Both are compatible with IKEv2, but flexVPN supports ONLY IKEv2, where dmvpn also supports IKEv1. So they dont necessarily have the IKE version in communality. Same with Hashing. While they both support the same pool of algorithms, that doesnt necesserily mean that they use the same algorithm in a particular setup.
FlexVPN uses NHRP for name resolution I believe. If you pay close attention to the option, it's saying it's the IOS is running the same NHRP being used, which is accurate as it's the build on the IOS.
FlexVPN NHRP is primarily used to establish spoke to spoke communication.
correct, it's C,
FlexVPN is based on these same fundamental technologies with DMVPN using IPSEC, GRE and NHRP
Reference : https://community.cisco.com/t5/network-security/what-is-the-difference-between-dmvpn-and-flexvpn/td-p/3438913
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