An engineer is designing a DMVPN network where OSPF has been chosen as the routing protocol. A spoke-to-spoke data propagation model must be set up. Which two design considerations must be taken into account? (Choose two.)
A.
The hub should be the DR by changing the priority of the spokes to 0
B.
The hub should be set as the DR by specifying the priority to 255
C.
The network type on all sites should be point-to-multipoint
D.
The network type should be point-to-multipoint for the hub and point-to-point for the spokes
E.
Configure all the sites as network type broadcast
Checked the link and based on this it's AE.
Hub, Spoke1 & Spoke2
(config)#interface Tunnel 0
(config-if)#ip ospf network broadcast
Spoke1 & Spoke2
(config)#interface Tunnel 0
(config-if)#ip ospf priority 0
A&C. In DMVPN spoke-to-spoke environment, network type of all routers should be point-to-multipoint and DR is not required. Set the priority to 0 for all spoke routers will effectively prevent participating in DE election.
I think A and E
It is necessary to set ip ospf priority 0 on the spoke router side so that the hub router becomes “DR”.
Since the default Tunnel I/F type is “Point-to-Point”, change the network type with ip ospf network broadcast so that route information can be exchanged with each spoke router individually.
Answer is A/C: These considerations ensure that the hub is the designated router (DR) for OSPF, which simplifies the routing process in a DMVPN environment. Setting the network type to point-to-multipoint on all sites helps in efficiently managing OSPF neighbor relationships and routing updates, facilitating direct communication between spokes.
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