Which overlay method can provide optimal transport over unreliable underlay networks that are behind NAT gateways?

SDWAN networks capitalize the usage of broadband Internet links over traditional MPLS links to offer more cost benefits to enterprise customers. However, due to the insecure nature of the public Internet, it is mandatory to use encryption of traffic between any two SDWAN edge devices installed behind NAT gateways.

Which overlay method can provide optimal transport over unreliable underlay networks that are behind NAT gateways?
A . TLS
B. DTLS
C. IPsec
D. GRE

View Answer

Answer: C