156-315.81.20 Advanced VPN Design Practice Question
An administrator is deploying a Route-Based VPN between two Check Point R81 Security Gateways to support dynamic routing over the tunnel. After configuring the VPN community as a Route-Based VPN type, the administrator notices that traffic is not being encrypted. What is the most likely reason?
⚠ Common exam trap
The trap here is assuming that a Route-Based VPN still relies on the encryption domain to select traffic, when in fact it uses routing and VTIs.
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 administrator did not configure a Virtual Tunnel Interface (VTI) and corresponding routes.
In a Route-Based VPN, Check Point uses Virtual Tunnel Interfaces (VTIs) to route traffic into the VPN tunnel. The administrator must create a VTI on each gateway and configure routing to direct traffic for the remote encryption domain into that interface. Without the VTI and appropriate routes, traffic will not be encrypted, even if the VPN community is configured correctly.
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 administrator did not configure a Virtual Tunnel Interface (VTI) and corresponding routes.
Why this is correct
In a Route-Based VPN, Check Point uses a Virtual Tunnel Interface (VTI) to route traffic into the tunnel. The administrator must create a VTI on each gateway and add routes pointing to that interface for the remote network. Without this, traffic will not be encrypted, even if the community is set to Route-Based VPN.
- ✗
The administrator did not configure NAT for the VPN traffic.
Why it's wrong here
NAT is not required for a Route-Based VPN to encrypt traffic. In fact, NAT can interfere with VPN traffic if not properly excluded. The failure to encrypt is due to missing VTI and routes, not NAT configuration. NAT is irrelevant to the basic encryption process in this scenario.
- ✗
The administrator did not enable IPsec on the Security Gateways.
Why it's wrong here
IPsec is enabled by default on Check Point Security Gateways when a VPN community is configured. The issue is not the enabling of IPsec but the method by which traffic is selected for encryption. In Route-Based VPN, traffic selection is based on routing, not on the encryption domain or a simple IPsec enablement.
- ✗
The VPN community was not configured with the correct encryption domain.
Why it's wrong here
While the encryption domain must be correctly defined for any VPN, in a Route-Based VPN the encryption domain is not used to determine which traffic is encrypted. Instead, routing decisions direct traffic into the VPN tunnel interface. Therefore, an incorrect encryption domain would not cause the observed failure if routing is properly configured.
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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 Check Point exam blueprint
This 156-315.81.20 practice question is part of Courseiva's free Check Point 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 156-315.81.20 exam.