The answer is that the Default-No-Decrypt rule is placed above the Decrypt-Web rule and matches all traffic, causing the web server traffic to never be decrypted. This occurs because decryption policy rule order follows a first-match-wins logic: the firewall evaluates rules from top to bottom and applies the first rule that matches the traffic. If a broad, catch-all rule like Default-No-Decrypt sits above a more specific rule, it will intercept all traffic—including the intended web server traffic—before the specific rule can be evaluated. On the PCNSA exam, this scenario tests your understanding of policy precedence and the common misconfiguration where a default deny rule blocks a specific allow rule. A frequent trap is assuming rules are evaluated by specificity rather than position. Remember the memory tip: "Top rules eat first—if a broad rule sits above, the specific rule never gets a bite."
PCNSA Decryption and Monitoring Practice Question
This PCNSA practice question tests your understanding of decryption and monitoring. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
Refer to the exhibit. A decryption policy has two rules. Traffic destined to a web server is not being decrypted. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The Default-No-Decrypt rule is above Decrypt-Web and matches all traffic
In Palo Alto Networks firewalls, decryption policy rules are evaluated in order from top to bottom, and the first matching rule is applied. If the 'Default-No-Decrypt' rule is placed above the 'Decrypt-Web' rule and matches all traffic (e.g., source/destination 'any'), then all traffic, including traffic to the web server, will match this rule first and will not be decrypted, preventing the 'Decrypt-Web' rule from ever being evaluated.
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 'strict' profile is misconfigured
Why it's wrong here
The traffic never reaches the Decrypt-Web rule because the default rule matches first.
✗
The Decrypt-Web rule has a profile that blocks decryption
Why it's wrong here
The profile would only be evaluated if the rule matched, but it doesn't.
✓
The Default-No-Decrypt rule is above Decrypt-Web and matches all traffic
Why this is correct
Rules are evaluated top-down; the no-decrypt rule matches before the decrypt rule.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The source is set to 'any' in the Decrypt-Web rule
Why it's wrong here
Source any is not an issue; the rule would match if reached.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Palo Alto Networks often tests the concept of rule order in decryption policies, where candidates mistakenly focus on profile settings or source/destination fields instead of recognizing that a higher-priority 'no-decrypt' rule matching all traffic will override any lower-priority decrypt rule.
Detailed technical explanation
How to think about this question
Palo Alto Networks decryption policy uses a first-match model similar to security policies. The 'Default-No-Decrypt' rule is a built-in rule that typically has a low priority (e.g., rule number 9999) and matches all traffic with a 'no-decrypt' action. If an administrator manually creates a rule with the same name or moves it above other rules, it will preempt them. In real-world scenarios, this often occurs when administrators inadvertently reorder rules or fail to disable the default rule, causing all decryption attempts to fail silently.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
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 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 Default-No-Decrypt rule is above Decrypt-Web and matches all traffic — In Palo Alto Networks firewalls, decryption policy rules are evaluated in order from top to bottom, and the first matching rule is applied. If the 'Default-No-Decrypt' rule is placed above the 'Decrypt-Web' rule and matches all traffic (e.g., source/destination 'any'), then all traffic, including traffic to the web server, will match this rule first and will not be decrypted, preventing the 'Decrypt-Web' rule from ever being evaluated.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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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