156-215.81.20 VPN Basics Practice Question
Which component in a Check Point VPN community defines the specific subnets that are permitted to send and receive traffic through the VPN tunnel?
⚠ Common exam trap
Candidates frequently confuse the role of Access Control rules with the Encryption Domain when defining which specific subnets traverse the VPN.
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
✓
Encryption Domain
The Encryption Domain defines the scope of traffic that must be encrypted by the VPN tunnel. By specifying the IP addresses and subnets that belong to the VPN community, the Check Point gateway can distinguish between traffic that needs protection and traffic that should be sent in the clear. This is a critical configuration step to ensure that only authorized data is encapsulated within the IPsec tunnel.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
VPN Gateway object
Why it's wrong here
The VPN Gateway object represents the physical or virtual gateway itself, including its identity and interface configuration. While it is part of the community, it does not define the actual subnets that are included in the encryption domain; those are defined by the network objects attached to it.
- ✓
Encryption Domain
Why this is correct
The Encryption Domain is the specific collection of network objects and subnets assigned to a gateway that are eligible for VPN protection. The gateway inspects all outgoing traffic against this domain; if it matches, the gateway initiates the VPN encapsulation process based on the community policy.
- ✗
IKE Phase 2 Proposal
Why it's wrong here
The IKE Phase 2 proposal defines the encryption, integrity, and lifetime parameters used for the data tunnel. It dictates how the traffic is secured, not which traffic is selected. Deciding which subnets belong to the tunnel is a policy-based decision, not a cryptographic one.
- ✗
VPN Community Object
Why it's wrong here
The VPN Community object defines the relationships, topology, and settings shared by the gateways in the community. While it links the gateways together, the specific subnets permitted are defined in the Encryption Domain settings, which are then associated with the gateways participating in the community.
Visual reference
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.
About these practice questions
One of 210 original 156-215.81.20 practice questions on Courseiva, each with a full explanation and wrong-answer analysis — not exam dumps or protected exam content. Learn why practice questions differ from exam dumps →
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 156-215.81.20 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 156-215.81.20 exam.