156-215.81.20 Security Policy and NAT Practice Question
Which TWO of the following are consequences of using 'Hide NAT' incorrectly in a network environment?
⚠ Common exam trap
Candidates often focus only on security implications and overlook technical limitations like port exhaustion. They underestimate how many concurrent connections can be supported by a single translated IP address.
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
✓
Port exhaustion due to high concurrent connections.
Incorrect Hide NAT usage can lead to port exhaustion, where too many connections share a single IP and run out of available source ports. Furthermore, it can cause return traffic routing failures if the upstream device does not know how to handle the translated source IP. Both issues result in significant connectivity outages for the internal services that rely on these NAT mappings.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Port exhaustion due to high concurrent connections.
Why this is correct
When many sessions share a single Hide NAT IP, the gateway runs out of available ports to map these sessions. This prevents new connections from being established, leading to intermittent connectivity issues for users. This is a common challenge in large organizations that share a single public IP for all outbound traffic.
- ✗
Increased security due to internal IP obfuscation.
Why it's wrong here
While obfuscation is a benefit, it is the intended outcome, not a consequence of 'incorrect' usage. 'Incorrect' usage implies a failure in the configuration that negatively impacts performance or connectivity, whereas proper obfuscation is a fundamental part of the security architecture when implemented correctly on a production gateway.
- ✓
Return traffic routing failures.
Why this is correct
If the translation address is not configured properly in the external routing environment, the return traffic will not be able to find its way back to the gateway. This results in asymmetric routing or complete connection failure, as the source device expects the response to arrive at the translated address.
- ✗
Automatic encryption of all internal traffic.
Why it's wrong here
NAT has absolutely nothing to do with encryption. Encryption is handled by the VPN and security blades. Assuming that NAT somehow provides security through encryption is a fundamental misunderstanding of the technology. NAT is strictly for address manipulation, not for securing data in transit or ensuring confidentiality over the network.
- ✗
Improved performance for all internal applications.
Why it's wrong here
NAT adds a processing overhead to the gateway, meaning it never improves performance. It is a necessary function for connectivity and security, but it consumes CPU and memory resources to manage the translation tables and perform header modifications, which can slightly degrade throughput in extremely high-traffic, low-resource scenarios.
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 156-215.81.20 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.