Question 500
After implementing a correction at a remote clinic network in Melbourne, engineers must verify that this original problem is resolved: The local spoke increments IPsec encapsulation counters but receives no decapsulated packets from the hub. Which observed result BEST demonstrates success?
Explanation
Correct Answer
This is the observable outcome for ipsec outbound-only counters. It tests whether the targeted change, 'Check return routing, reverse crypto parameters and WAN filtering along the opposite direction', actually resolved the reported issue at a remote clinic network in Melbourne. The original failure was: The local spoke increments IPsec encapsulation counters but receives no decapsulated packets from the hub.
Incorrect Answers
That observation verifies tunnel ipsec profile binding in a different situation, such as when spoke-to-hub GRE packets are being sent without the required encryption because no tunnel protection profile is attached. For the reported ipsec outbound-only counters incident at a remote clinic network in Melbourne, the required acceptance evidence is: Both encryption and decryption counters increase during bidirectional protected testing. This other result does not test that condition directly.
That observation verifies ike esp underlay filtering in a different situation, such as when a DMVPN peer can ping its hub's public interface but IKE or ESP packets are blocked by a WAN ACL. For the reported ipsec outbound-only counters incident at a remote clinic network in Melbourne, the required acceptance evidence is: Both encryption and decryption counters increase during bidirectional protected testing. This other result does not test that condition directly.
That observation verifies nat-t reachability in a different situation, such as when a DMVPN spoke behind NAT cannot establish IPsec because the path filters NAT traversal traffic. For the reported ipsec outbound-only counters incident at a remote clinic network in Melbourne, the required acceptance evidence is: Both encryption and decryption counters increase during bidirectional protected testing. This other result does not test that condition directly.