- A
The decryption rule has a schedule that is not currently active.
A rule with a schedule that is out of window will not match, so decryption will not apply.
- B
The SSH protocol is being used instead of SSL/TLS.
Why wrong: SSH is not decrypted by SSL/TLS decryption; it would require SSH decryption, but it doesn't cause a 'failure to decrypt' – it simply doesn't match.
- C
The firewall's decryption hardware accelerator is faulty.
Why wrong: A faulty accelerator might degrade performance but does not cause individual sessions to bypass decryption.
- D
The server certificate is signed by a CA not trusted by the firewall.
If the decryption profile allows untrusted certificates, the session may be allowed without decryption.
- E
The session uses a cipher that is not listed in the decryption profile's allowed ciphers.
If the cipher is not in the allowed list, the firewall cannot decrypt the session.
Quick Answer
The answer is that an inactive schedule in a decryption rule is one of three factors causing SSL decryption failure or bypass. This occurs because the firewall evaluates the rule’s schedule before attempting decryption; if the schedule is not currently active, the rule is effectively disabled, and the matching traffic bypasses decryption entirely. On the Palo Alto Networks Certified Network Security Administrator PCNSA exam, this concept tests your understanding of how decryption profiles and rules interact—specifically, that schedule-based bypass is a common oversight. A frequent trap is assuming decryption rules apply continuously, but the firewall strictly enforces time-based schedules. Other bypass factors include unsupported cipher suites in the decryption profile and certificate validation failures. Remember the mnemonic “S-C-C” for Schedule, Cipher, Certificate—three silent bypass triggers that can leave traffic unexamined.
PCNSA Decryption and Monitoring Practice Question
This PCNSA practice question tests your understanding of decryption and monitoring. 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.
During SSL decryption, which three factors can cause the firewall to fail to decrypt a session or to bypass decryption?
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
The decryption rule has a schedule that is not currently active.
Option A is correct because a decryption rule with a schedule that is not currently active will not apply, causing the firewall to bypass decryption for the matching traffic. The firewall checks the schedule before attempting decryption, and if the schedule is inactive, the rule is effectively disabled, leading to a bypass.
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.
- ✓
The decryption rule has a schedule that is not currently active.
Why this is correct
A rule with a schedule that is out of window will not match, so decryption will not apply.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The SSH protocol is being used instead of SSL/TLS.
- ✗
The firewall's decryption hardware accelerator is faulty.
Why it's wrong here
A faulty accelerator might degrade performance but does not cause individual sessions to bypass decryption.
- ✓
The server certificate is signed by a CA not trusted by the firewall.
Why this is correct
If the decryption profile allows untrusted certificates, the session may be allowed without decryption.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
The session uses a cipher that is not listed in the decryption profile's allowed ciphers.
Why this is correct
If the cipher is not in the allowed list, the firewall cannot decrypt the session.
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 may think a faulty hardware accelerator (Option C) directly causes decryption failure, but Palo Alto Networks firewalls fall back to software decryption if hardware acceleration fails, so it does not result in a bypass or failure to decrypt.
Detailed technical explanation
How to think about this question
The firewall's SSL decryption relies on a decryption profile that defines allowed ciphers, trusted CA certificates, and schedules. If a server certificate is signed by an untrusted CA (Option D), the firewall cannot validate the certificate chain and will fail decryption. Similarly, if the session uses a cipher not in the allowed list (Option E), the firewall cannot negotiate the decryption handshake. These checks occur during the SSL/TLS handshake, before any application data is exchanged.
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 PCNSA 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.
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FAQ
Questions learners often ask
What does this PCNSA question test?
Decryption and Monitoring — This question tests Decryption and Monitoring — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The decryption rule has a schedule that is not currently active. — Option A is correct because a decryption rule with a schedule that is not currently active will not apply, causing the firewall to bypass decryption for the matching traffic. The firewall checks the schedule before attempting decryption, and if the schedule is inactive, the rule is effectively disabled, leading to a bypass.
What should I do if I get this PCNSA 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.
About these practice questions
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Last reviewed: Jun 25, 2026
This PCNSA 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 PCNSA exam.
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