Refer to the exhibits.
Which configuration allows spoke-to-spoke communication using loopback as a tunnel source?
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Question 100
Correct Answer: D
For spoke-to-spoke communication using a loopback as a tunnel source in a Dynamic Multipoint Virtual Private Network (DMVPN), it is important that the configuration allows for dynamic discovery of the peers. The command 'crypto isakmp key cisco address 0.0.0.0' on the spokes would enable this dynamic peer discovery, as it allows the spoke devices to establish ISAKMP (Internet Security Association and Key Management Protocol) sessions with any peer, which is essential for dynamic spoke-to-spoke interactions. This configuration is necessary to facilitate the dynamic nature of the connections in a DMVPN setup and to ensure that the loopback addresses used for the tunnel sources can communicate properly.
Discussion
studybuddy10Option: D
Given answer is correct - D , the spokes dynamic tunnels with loopback sources are coming from 2.2.2.2 and 3.3.3.3 so only spokes with 0.0.0.0 would satisfy that.
HungarianDishOption: D
for spoke-to-spoke we need to add this on the spokes too https://community.cisco.com/t5/vpn/isakmp-with-0-0-0-0-dmvpn/td-p/4312380
BruffasOption: D
I would assume that since we see the config on one spoke, that alternative A already is set on the HUB. In that case D is the only answer that makes sense.
chris7890
Is it possible that the command must be executed on the hub and on the spoke router? Configure ISAKMP on all devices: ... crypto isakmp key cisco address 0.0.0.0 https://ccieme.wordpress.com/2021/09/09/cisco-dynamic-multipoint-vpn/
SeMo0o0o0Option: D
D is correct
FrankZaneOption: A
I think A is correct https://www.cisco.com/en/US/technologies/tk583/tk372/technologies_white_paper0900aecd802b8f3c.html