156-315.81.20 Advanced VPN Design Practice Question
An administrator is configuring a VPN community and needs to ensure that only specific subnets are encrypted. Which setting should be configured to restrict the traffic that enters the tunnel?
⚠ Common exam trap
Students often select encryption rules or firewall access rules instead of the VPN Domain object when trying to restrict traffic entering a VPN tunnel.
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 VPN Domain object.
The VPN Domain object defines the specific internal networks allowed to traverse the VPN tunnel. By correctly defining the VPN Domain, the administrator ensures that only authorized traffic is encrypted and sent to the peer. This is crucial for network security and avoiding 'leaking' traffic that should otherwise remain internal or be routed through a different path, thus maintaining strict segmentation and data protection requirements.
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 Security Policy rules.
Why it's wrong here
While the security policy permits traffic, it does not define the 'VPN Domain' encryption scope. If traffic matches a VPN rule but is not in the defined VPN domain, the gateway will not perform the encryption, potentially sending the traffic unencrypted if the security policy otherwise allows it.
- ✓
The VPN Domain object.
Why this is correct
The VPN Domain object explicitly lists the networks that the gateway considers part of its protected side for the VPN community. Traffic destined for or originating from these networks will be triggered for encryption. Configuring this object accurately is the primary method for controlling what traffic enters the tunnel.
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The Gateway Topology settings.
Why it's wrong here
Topology settings determine how interfaces are categorized as external, internal, or DMZ. While this influences the anti-spoofing mechanism, it does not specifically restrict which subnets are permitted to be encrypted for a VPN community. The VPN Domain remains the specific object for defining tunnel-accessible networks.
- ✗
The NAT configuration.
Why it's wrong here
NAT is used to translate addresses, not to define the scope of encrypted traffic. Modifying NAT settings will change the source or destination IP of the packet, but it does not dictate whether the traffic should be routed into the VPN tunnel based on its original, internal network subnets.
Visual reference
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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.