PCNSE Decryption and SSL Inspection Practice Question
A security administrator wants to minimize the performance impact of SSL decryption on the firewall. Which best practice should be applied?
⚠ Common exam trap
A common mix-up: candidates think distributing decryption per interface (Option A) is a valid load-balancing technique, but Palo Alto Networks firewalls do not support interface-level decryption configuration, and the correct approach is to use exclusion rules to selectively bypass decryption for low-risk traffic.
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
✓
Create decryption exclusion rules for traffic that is known to be low-risk and high-volume.
Creating decryption exclusion rules for low-risk, high-volume traffic (e.g., software updates, video streaming, or trusted CDN traffic) reduces the firewall's decryption workload, minimizing performance impact while still allowing decryption of sensitive or risky traffic. This aligns with Palo Alto Networks best practices to balance security and performance by excluding traffic that does not require inspection.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Configure decryption settings per interface to distribute load.
Why it's wrong here
Decryption is configured in a decryption policy applied to zones, not per interface, so this setting does not exist as described and cannot distribute load. Per-interface configuration is used for other features, such as management profiles or virtual routers.
- ✗
Disable SSL decryption entirely to avoid performance issues.
Why it's wrong here
Disabling decryption removes all threat visibility, which is the firewall's purpose; performance is preserved by exempting trusted, low-risk traffic instead. Full disablement would be the choice only where legal or privacy mandates forbid inspection of any traffic.
- ✓
Create decryption exclusion rules for traffic that is known to be low-risk and high-volume.
Why this is correct
Excluding low-risk, high-volume traffic from decryption directly reduces the CPU load on the firewall's dataplane, since each TLS session otherwise consumes processing for handshake and inspection. This satisfies the stem's constraint of minimising SSL decryption performance impact while preserving decryption for genuinely risky traffic.
- ✗
Enable decryption on all traffic to ensure complete visibility.
Why it's wrong here
Decrypting everything maximises processing load, the opposite of the goal. Selective decryption, exempting categories such as financial or health traffic, is the documented best practice; decrypt-all suits environments with ample capacity and no privacy constraints.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This PCNSE practice question is part of Courseiva's free Palo Alto Networks 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 PCNSE exam.