PCNSE Core Concepts and Architecture Practice Question
This PCNSE practice question tests your understanding of core concepts and architecture. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company implements SSL Forward Proxy decryption. Users complain that accessing certain websites, such as video streaming and software updates, is slow. Which action should the administrator take to improve performance?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Exclude known high-traffic sites from decryption.
Option C is correct because excluding known high-traffic sites (e.g., video streaming and software update servers) from SSL Forward Proxy decryption reduces the processing overhead on the firewall. Decrypting and re-encrypting high-volume traffic consumes significant CPU and memory resources, causing latency. By bypassing decryption for these sites, the firewall can forward traffic directly, improving performance without sacrificing security for other traffic.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Increase the SSL session cache to 1024.
Why it's wrong here
Increasing the cache may help slightly but not significantly for high-traffic sites.
✗
Upgrade the firewall to a higher model.
Why it's wrong here
Upgrading hardware may improve performance but is not the immediate best practice; excluding sites is more efficient.
✓
Exclude known high-traffic sites from decryption.
Why this is correct
Best practice is to exclude categories like streaming and updates from decryption to reduce load.
Related concept
Read the scenario before looking for a memorised answer.
✗
Enable SSL session re-use.
Why it's wrong here
Session re-use can improve performance but is not as effective as excluding high-traffic sites.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often focus on optimizing TLS handshake performance (session cache or reuse) rather than recognizing that the primary bottleneck is the decryption of large data payloads, which is unaffected by handshake optimizations.
Detailed technical explanation
How to think about this question
SSL Forward Proxy decryption requires the firewall to terminate the client's TLS connection, inspect the plaintext, and then establish a new TLS connection to the server. This double encryption/decryption process is CPU-intensive, especially for high-throughput streams like video or large updates. Excluding such sites from decryption leverages the firewall's ability to apply a no-decrypt policy based on URL categories or custom URL lists, allowing traffic to bypass the proxy entirely and be forwarded at line rate.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the PCNSE exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Core Concepts and Architecture — This question tests Core Concepts and Architecture — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Exclude known high-traffic sites from decryption. — Option C is correct because excluding known high-traffic sites (e.g., video streaming and software update servers) from SSL Forward Proxy decryption reduces the processing overhead on the firewall. Decrypting and re-encrypting high-volume traffic consumes significant CPU and memory resources, causing latency. By bypassing decryption for these sites, the firewall can forward traffic directly, improving performance without sacrificing security for other traffic.
What should I do if I get this PCNSE question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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