A network administrator is establishing a site-to-site VPN between a Palo Alto Networks firewall and...

Basic Concept: Policy-based third-party VPN gateways require matching traffic selectors. PAN-OS represents those selectors as Proxy IDs under the IPSec tunnel configuration.

Why A is Correct: Defining local and remote subnets in Proxy ID settings aligns PAN-OS with the Check Point encryption domain and resolves Phase 2 failures.

Why B is Wrong: Create individual Security policies for each pair of local and remote subnets. relates to VPN configuration, but it does not address the specific PAN-OS requirement for selectors, tunnel interface functions, routing, or Security policy in this scenario.

Why C is Wrong: Assign a specific IP address to the tunnel interface to match the Check Point gateway. relates to VPN configuration, but it does not address the specific PAN-OS requirement for selectors, tunnel interface functions, routing, or Security policy in this scenario.

Why D is Wrong: Enable Dead Peer Detection (DPD) in the IKE Gateway configuration. relates to VPN configuration, but it does not address the specific PAN-OS requirement for selectors, tunnel interface functions, routing, or Security policy in this scenario.