Refer to the exhibit. Each branch network must connect to the HQ and other branch networks over the phase 2 DMVPN network using a single tunnel interface. OSPF is running over the DMVPN network…

Point-to-point network type is designed for a single neighbor and does not support the multipoint nature of a DMVPN hub-and-spoke topology with a single tunnel interface.

Point-to-multipoint network type modifies routes so that the next-hop is set to the hub's address for all spoke prefixes, breaking Phase 2 spoke-to-spoke direct tunneling.

In DMVPN Phase 2, spoke routers must resolve routes to other spokes using the remote spoke's tunnel IP as the next-hop - not the hub's address - so that the NHRP resolution process can trigger a direct spoke-to-spoke tunnel. OSPF broadcast network type elects the hub as the DR, and the DR advertises LSAs while preserving the originating router's next-hop address. This allows each spoke to see the correct next-hop for other spokes and build direct tunnels.

Nonbroadcast network type requires manual neighbor statements and also modifies next-hop to the hub's address, which prevents Phase 2 direct spoke-to-spoke communication.