PCNSE Secure Access and VPN Practice Question
A network engineer is configuring a route-based IPsec VPN between a Palo Alto Networks firewall and a third-party VPN peer. The engineer wants to ensure that the firewall can establish the tunnel even if the peer initiates the connection. Which configuration is required on the Palo Alto Networks firewall?
⚠ Common exam trap
The trap here is thinking that a special mode like 'Passive' or 'Responder Only' is needed for the firewall to accept peer-initiated connections, when actually the standard gateway configuration suffices.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure the IKE gateway with a static peer IP address and ensure that the pre-shared key and proposals match the peer.
In Palo Alto Networks, an IKE gateway configured with a static peer IP address and matching pre-shared key and proposals will accept IKE requests from that peer. The firewall does not require a special mode to respond to peer-initiated connections; it can act as both initiator and responder. The key is that the gateway configuration must match the peer's settings.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Configure the IKE gateway with a static peer IP address and enable 'Passive' mode.
Why it's wrong here
Passive mode is used for NAT traversal or when the peer IP is not known. However, enabling passive mode alone does not allow the firewall to respond to a peer-initiated connection; it must also have the correct pre-shared key and proposals. But passive mode is not required for the firewall to accept connections; by default, the firewall can respond to IKE requests if the gateway is configured.
- ✗
Configure the IPsec tunnel with 'Auto Key' and enable 'Responder Only' mode.
Why it's wrong here
'Responder Only' mode is not a standard option in Palo Alto Networks IKE gateway configuration. The firewall can act as both initiator and responder by default. Auto Key is the standard mode for IPsec tunnels. This option describes a non-existent setting and would not achieve the requirement.
- ✗
Configure the IKE gateway with a dynamic peer IP address and enable 'Aggressive' mode.
Why it's wrong here
Aggressive mode is used for faster negotiation but is less secure. It is not required for the firewall to accept peer-initiated connections. A dynamic peer IP address is used when the peer's IP is not fixed, but the question does not specify that. The firewall can accept connections with a static peer IP as well.
- ✓
Configure the IKE gateway with a static peer IP address and ensure that the pre-shared key and proposals match the peer.
Why this is correct
For the firewall to establish a tunnel, the IKE gateway must be configured with the peer IP address (static or dynamic) and the correct pre-shared key and proposals. The firewall will respond to IKE requests from the peer if the gateway configuration matches. No special mode is required to accept peer-initiated connections; the firewall can initiate or respond by default.
Quick reference
VPN Protocol Comparison
| Protocol | Port | Encryption | Authentication | Use Case |
|---|---|---|---|---|
| IKEv2 / IPsec | UDP 500 / 4500 | AES-256 | Certificates / PSK | Site-to-site & remote access |
| SSL / TLS VPN | TCP 443 | TLS 1.3 | Certificates / MFA | Clientless remote access |
| L2TP / IPsec | UDP 1701 | AES (IPsec) | PSK / Certificates | Legacy remote access |
| WireGuard | UDP 51820 | ChaCha20 | Public keys | Modern high-performance VPN |
| PPTP | TCP 1723 | MPPE (weak) | MS-CHAPv2 | Legacy — avoid in production |
PPTP is considered insecure. IKEv2/IPsec and SSL VPN are the current recommended options.
Go deeper
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Palo Alto Networks exam blueprint
This PCNSE practice question is part of Courseiva's free Palo Alto Networks certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PCNSE exam.