Refer to the exhibit. An engineer must configure DMVPN between the hub and two spokes. The engineer already configured the hub, but the tunnel fails to come up. Which two commands must be used to…

Without exhibit context confirming the spoke's tunnel IP is misconfigured, there is no basis to change it to 20.1.1.2 as the root cause of the tunnel failure.

20.1.1.1 is the hub's tunnel interface IP address, and assigning it to a spoke would create an IP conflict on the mGRE subnet.

In DMVPN, each spoke's tunnel destination must point to the hub's NBMA (public) IP address - in this case 30.1.1.2 - so the initial GRE tunnel can form and the spoke can send its NHRP registration to the hub. An incorrect tunnel destination prevents the spoke from reaching the hub entirely.

30.1.1.3 does not correspond to the hub's public IP, so using it as the tunnel destination would target a non-existent peer and the tunnel would never establish.

30.0.0.1 is not a valid tunnel source for this spoke based on the addressing scheme shown, and changing the source to a non-existent interface IP would break reachability.