Implementing Cisco IP Routing (CCNP ROUTE, legacy) — Question 349

Which condition prevents the establishment of a DMVPN tunnel between two spokes?

Answer options

• A. The two spokes are behind different PAT devices.
• B. The two spokes have different tunnel keepalive settings.
• C. IPsec is enabled on the spoke devices.
• D. HSRP is enabled on the spoke devices.

Correct answer: D

Explanation

Answer D is correct because HSRP (Hot Standby Router Protocol) can interfere with the DMVPN tunnel establishment by causing routing inconsistencies. The other options do not inherently prevent the establishment of a DMVPN tunnel, as spokes can operate behind different PAT devices, have varying keepalive settings, and still function with IPsec enabled.