Refer to the exhibit. Which interface configuration must be configured on the spoke A router to enable a dynamic DMVPN tunnel with the spoke B router? A. B. C. D.
A is not correct, tunnel source can't be 10.0.0.1
B seems to be ok
C is not correct, missing multipoint on tunnel mode gre.
D is not correct, ip nhrp map multicast static is not a valid command.
The correct answer is B
It is hard to choose from these answers. Phase 2 would really need this on the spokes: #ip nhrp map multicast x.x.x.x
(#ip nhrp map multicast dynamic -> it is configured on the HUB, so obviously incorrect)
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/sec_conn_dmvpn/configuration/xe-16-7/sec-conn-dmvpn-xe-16-7-book/sec-conn-dmvpn-dmvpn.html
B will not allow spoke to spoke tunnel. ip nhrp map multicast dynamic and tunnel mode gre multipoint are required. I think the question would assume phase 1 already configured and working. Then would go with A to change it to phase 2
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