Which two actions resolve the issue?

Refer to the exhibit.

After applying IPsec, the engineer observed that the DMVPN tunnel went down, and both spoke-to-spoke and hub were not establishing.

Which two actions resolve the issue? (Choose two.)
A . Configure the crypto isakmp key cisco address 192.1.1.1 on R2 and R3
B . Configure the crypto isakmp key cisco address 0.0.0.0 on R2 and R3.
C . Change the mode from mode tunnel to mode transport on R3
D . Change the mode from mode transport to mode tunnel on R2.
E . Remove the crypto isakmp key cisco address 10.1.1.1 on R2 and R3

View Answer

Answer: AD

Explanation:

*When using DMVPN with IPSec, it is unnecessary to use tunnel mode. Because DMVPN uses GRE which means that a new IP header is already added by GRE. The GRE encapsulation happens on the tunnel interface before the encryption process takes place.