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PCNSE · Question #18

An Administrator is configuring an IPSec VPN toa Cisco ASA at the administrator's home and experiencing issues completing the connection. The following is th output from the command: What could be…

The correct answer is A. The public IP addresses do not match for both the Palo Alto Networks Firewall and the ASA. During IKE Phase 1 negotiation, each peer must identify and reach the correct remote peer IP address. If the public IP addresses configured on either side do not match the actual peer's IP address, IKE Phase 1 will fail and the tunnel will never establish. This is the most…

Submitted by lucia.co· Apr 18, 2026Configuration Troubleshooting

Question

An Administrator is configuring an IPSec VPN toa Cisco ASA at the administrator's home and experiencing issues completing the connection. The following is th output from the command:

What could be the cause of this problem?

Exhibit

PCNSE question #18 exhibit

Options

  • AThe public IP addresses do not match for both the Palo Alto Networks Firewall and the ASA.
  • BThe Proxy IDs on the Palo Alto Networks Firewall do not match the settings on the ASA.
  • CThe shared secrets do not match between the Palo Alto firewall and the ASA
  • DThe deed peer detection settings do not match between the Palo Alto Networks Firewall and the

How the community answered

(31 responses)
  • A
    94% (29)
  • C
    3% (1)
  • D
    3% (1)

Explanation

During IKE Phase 1 negotiation, each peer must identify and reach the correct remote peer IP address. If the public IP addresses configured on either side do not match the actual peer's IP address, IKE Phase 1 will fail and the tunnel will never establish. This is the most fundamental prerequisite - before shared secrets (C), proxy IDs (B), or DPD settings (D) are even evaluated, the peers must successfully identify each other by IP. A mismatch in public IP addresses would produce an immediate Phase 1 failure, which aligns with the described symptom of the connection not completing.

Topics

#IPSec VPN#VPN Troubleshooting#Network Addressing#Firewall Configuration

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