Which two methods use IPsec to provide secure connectivity from the branch office to the headquarters office?

ccnp-dump
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ccnp-route

#1

Which two methods use IPsec to provide secure connectivity from the branch office to the headquarters office? (Choose two.)
A. DMVPN
B. MPLS VPN
C. Virtual Tunnel Interface (VTI)
D. SSL VPN
E. PPPoE

Correct Answer: AC

Explanation:
The Dynamic Multipoint VPN (DMVPN) feature allows users to better scale large and small IPSec VPNs by
combining generic routing encapsulation (GRE) tunnels, IPSec encryption, and Next Hop Resolution Protocol
(NHRP) to provide users with easy configuration through crypto profiles, which override the requirement for
defining static crypto maps, and dynamic discovery of tunnel endpoints.

The use of VTI greatly simplifies the configuration process when you need to configure IPsec. A major benefit associated with IPsec VTIs is that the configuration does not require a static mapping of IPsec sessions to a physical interface.