PCNSE Decryption and SSL Inspection Practice Question
This PCNSE practice question tests your understanding of decryption and ssl inspection. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
Which THREE steps should be taken to troubleshoot an SSL decryption issue where users are unable to access specific HTTPS websites? (Choose three.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Check the decryption log for errors such as 'ssl_decrypt_unsupported_cipher' or 'ssl_decrypt_cert_verify_failed'.
Option A is correct because the decryption log provides direct visibility into SSL/TLS handshake failures. Errors like 'ssl_decrypt_unsupported_cipher' indicate the firewall cannot negotiate a cipher it supports, while 'ssl_decrypt_cert_verify_failed' points to certificate validation issues, such as an untrusted or expired server certificate. These logs are the primary diagnostic tool for pinpointing why decryption fails for specific HTTPS sites.
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.
✓
Check the decryption log for errors such as 'ssl_decrypt_unsupported_cipher' or 'ssl_decrypt_cert_verify_failed'.
Why this is correct
Logs provide specific error hints.
Related concept
Read the scenario before looking for a memorised answer.
✗
Update the URL filtering database to ensure the site is categorized correctly.
Why it's wrong here
Does not affect decryption; that affects policy matching.
✓
Verify that the firewall's decryption certificate is trusted by the client.
Why this is correct
Untrusted certificates cause browser warnings.
Related concept
Read the scenario before looking for a memorised answer.
✗
Disable decryption globally to see if the sites become accessible.
Why it's wrong here
This is a disruptive workaround, not a troubleshooting step.
✓
Use the packet capture tool to analyze the SSL handshake between client, firewall, and server.
Why this is correct
Packet capture reveals handshake failures.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse decryption failures with URL filtering or policy issues, leading them to select option B, when in fact decryption logs and certificate trust are the direct troubleshooting steps for SSL decryption problems.
Detailed technical explanation
How to think about this question
During SSL decryption, the firewall acts as a man-in-the-middle, terminating the client's TLS connection and initiating a new TLS connection to the server. The firewall must present a certificate trusted by the client; if the client does not trust the firewall's CA, the handshake fails with a certificate error. Additionally, the firewall's cipher suite must match both the client's and server's supported ciphers; if the server requires a cipher the firewall does not support (e.g., TLS 1.3-only ciphers), decryption fails with 'ssl_decrypt_unsupported_cipher'.
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.
Decryption and SSL Inspection — This question tests Decryption and SSL Inspection — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Check the decryption log for errors such as 'ssl_decrypt_unsupported_cipher' or 'ssl_decrypt_cert_verify_failed'. — Option A is correct because the decryption log provides direct visibility into SSL/TLS handshake failures. Errors like 'ssl_decrypt_unsupported_cipher' indicate the firewall cannot negotiate a cipher it supports, while 'ssl_decrypt_cert_verify_failed' points to certificate validation issues, such as an untrusted or expired server certificate. These logs are the primary diagnostic tool for pinpointing why decryption fails for specific HTTPS sites.
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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