Question 140
During a cross-team security policy review at Prairie Health Network, engineers say that they resolved this finding: A site-to-site tunnel fails because two peers propose incompatible IKE algorithms. Which result provides the STRONGEST acceptance evidence?
Explanation
Correct Answer
IKE negotiation succeeds with mutually accepted secure proposals. This is the decisive evidence for the original problem: A site-to-site tunnel fails because two peers propose incompatible IKE algorithms. It verifies that the intended corrective control—Align policy proposals for IKE version, cipher, integrity or PRF, DH group, and authentication—works in the relevant environment; a completed change ticket alone would not prove the outcome at Prairie Health Network.
Incorrect Answers
Authorized spoke pairs establish protected paths without routing all payload traffic through the hub. This would be relevant evidence for a different failure: A large hub-and-spoke organization needs dynamically established encrypted spoke-to-spoke paths, usually addressed by Use a supported DMVPN design with controlled NHRP and IPsec protection. It does not demonstrate that the current problem at Prairie Health Network was resolved. The specific required evidence is: IKE negotiation succeeds with mutually accepted secure proposals.
Authorized group members decrypt permitted traffic and a nonmember cannot use group keys. This would be relevant evidence for a different failure: A network design requires encryption of multicast group traffic across a private WAN overlay, usually addressed by Evaluate GETVPN group-key encryption where the transport supports its required routing properties. It does not demonstrate that the current problem at Prairie Health Network was resolved. The specific required evidence is: IKE negotiation succeeds with mutually accepted secure proposals.
Both peers establish the tunnel and routing to the authorized remote prefixes works. This would be relevant evidence for a different failure: Two branches require permanent routed encrypted connectivity with clear tunnel interface monitoring, usually addressed by Select route-based IPsec VPN with virtual tunnel interfaces and appropriate routing controls. It does not demonstrate that the current problem at Prairie Health Network was resolved. The specific required evidence is: IKE negotiation succeeds with mutually accepted secure proposals.