PCNSE Secure Access and VPN Practice Question
A network engineer configures a tunnel interface for IPSec VPN. After committing, the interface is up but no traffic passes. The tunnel itself is established (IKEv2). What should the engineer check first?
⚠ Common exam trap
A common mix-up: candidates assume a tunnel is functional once IKEv2 phase 1 and phase 2 SAs are established, overlooking that the tunnel interface itself must have an IP address to be routable and pass traffic.
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
✓
The tunnel interface has no IP address
For an IPSec tunnel interface to pass traffic, it must have an IP address assigned. Without an IP address, the tunnel interface cannot participate in routing, and the firewall will not forward packets into or out of the tunnel, even though the IKEv2 security associations are established. The IP address is required for the tunnel to be a valid next-hop in the routing table.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The tunnel interface is in the wrong virtual router
Why it's wrong here
Wrong VR would cause routing issues, but IP address is more fundamental.
- ✓
The tunnel interface has no IP address
Why this is correct
A tunnel interface requires an IP address to route traffic; without it, packets are not routed.
- ✗
The tunnel interface is not assigned to a zone
Why it's wrong here
Zone is required for security policy but traffic would still be sent if IP is configured.
- ✗
The tunnel interface does not have a management profile
Why it's wrong here
Management profile is for administrative access, not data traffic.
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 by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.