156-315.81.20 Advanced VPN Design Practice Question
Which VPN feature should be used to protect a gateway from being overwhelmed by a flood of VPN connection attempts?
⚠ Common exam trap
Test-takers frequently confuse general firewall anti-spoofing or general DoS protections with specialized VPN features designed specifically to mitigate IKE negotiation floods.
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
✓
VPN Rate Limiting.
VPN Rate Limiting prevents DoS attacks from exhausting gateway resources. By capping the number of IKE negotiations per second, the gateway ensures that legitimate traffic remains unaffected. This is a critical defensive measure in exposed environments where internet-facing gateways are susceptible to automated scanning or brute-force attempts targeting the VPN services, maintaining uptime and stability for remote users.
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 Rate Limiting.
Why this is correct
VPN Rate Limiting is specifically designed to control the volume of IKE negotiation requests, protecting the CPU and memory of the security gateway. By enforcing a threshold on incoming connection attempts, the gateway can defend itself against malicious floods of VPN connection requests that would otherwise cause service denial.
- ✗
IKEv2 Fragmentation.
Why it's wrong here
IKEv2 Fragmentation is used to handle large IKE packets that exceed the network MTU, preventing packet loss. It is not a security or resource-management feature designed to protect the gateway from connection floods; it is a protocol-level mechanism to ensure successful negotiation over restrictive network paths.
- ✗
Dead Peer Detection (DPD).
Why it's wrong here
DPD is a monitoring function used to detect if a peer has gone offline. It does not provide any protection against excessive connection attempts. It is strictly a connectivity-management tool that helps in the efficient teardown of dead tunnels, rather than a security control for resource protection.
- ✗
VPN Domain enforcement.
Why it's wrong here
VPN Domain enforcement is used to define which internal subnets are allowed to be encrypted. It does not manage the rate of incoming connections. An attacker could still attempt to connect from unauthorized IPs, and even if they don't reach the domain, the gateway would still waste resources negotiating.
About these practice questions
This 156-315.81.20 question is part of Courseiva's 210-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. 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 156-315.81.20 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.