- A
The security policy is set to deny due to an implicit deny rule.
Why wrong: Since an explicit allow rule is configured, it overrides the implicit deny. The issue is not the policy itself but the zone protection profile.
- B
The zone protection profile has Flood Protection thresholds set too low, causing legitimate traffic to be dropped.
Flood Protection thresholds can drop traffic that exceeds defined limits, even if the traffic is legitimate.
- C
The security policy has a logging profile attached that is blocking traffic.
Why wrong: Logging profiles only specify how to log traffic, not whether to block or allow it.
- D
The security policy has a schedule configured that is currently outside the allowed time.
Why wrong: If a schedule were configured, it would be visible in the policy and would only deny traffic during off-hours, but the policy is set to allow always.
Quick Answer
The correct answer is that the zone protection profile has Flood Protection thresholds set too low, causing legitimate traffic to be dropped. This occurs because Flood Protection in a zone protection profile is designed to mitigate denial-of-service attacks by limiting the rate of new sessions, but when thresholds are configured too aggressively, they can mistakenly classify normal outbound traffic as a flood and block it—even when a security policy explicitly allows all traffic from the internal zone to the external zone. On the PCNSA exam, this scenario tests your understanding of how zone protection profiles interact with security policies, a common trap being that candidates assume a permissive policy always guarantees traffic flow, overlooking that flood protection operates at the zone level before policy evaluation. Remember the memory tip: “Policy permits, but protection prohibits”—always check flood thresholds when legitimate traffic is denied despite a wide-open rule.
PCNSA Core Concepts Practice Question
This PCNSA practice question tests your understanding of core concepts. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 network administrator notices that traffic from the internal zone to the external zone is being denied, even though a security policy allowing all outbound traffic exists. The internal zone is configured with a zone protection profile that has Flood Protection enabled. What is the most likely cause of the denial?
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 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 zone protection profile has Flood Protection thresholds set too low, causing legitimate traffic to be dropped.
Option A is correct because the zone protection profile's Flood Protection can erroneously block legitimate traffic if threshold values are too low. Option B is wrong because logging profiles do not affect traffic flow. Option C is wrong because schedule settings would either allow or deny traffic at certain times, but the policy is set to allow always. Option D is wrong because the zone protection profile with Flood Protection is the most likely cause, not the security policy itself.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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 security policy is set to deny due to an implicit deny rule.
Why it's wrong here
Since an explicit allow rule is configured, it overrides the implicit deny. The issue is not the policy itself but the zone protection profile.
- ✓
The zone protection profile has Flood Protection thresholds set too low, causing legitimate traffic to be dropped.
Why this is correct
Flood Protection thresholds can drop traffic that exceeds defined limits, even if the traffic is legitimate.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
- ✗
The security policy has a logging profile attached that is blocking traffic.
Why it's wrong here
Logging profiles only specify how to log traffic, not whether to block or allow it.
- ✗
The security policy has a schedule configured that is currently outside the allowed time.
Why it's wrong here
If a schedule were configured, it would be visible in the policy and would only deny traffic during off-hours, but the policy is set to allow always.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
- Standard ACLs match source addresses.
- Extended ACLs can match source, destination, protocol and ports.
- The first matching ACL entry is used.
- There is usually an implicit deny at the end.
TExam Day Tips
- Check inbound versus outbound direction.
- Read the ACL from top to bottom.
- Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
How this comes up in practice
A security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
What to study next
Got this wrong? Here's your next step.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related PCNSA ACL questions on filtering logic and placement.
- →
Core Concepts — study guide chapter
Learn the concepts, then practise the questions
- →
Core Concepts practice questions
Targeted practice on this topic area only
- →
All PCNSA questions
524 questions across all exam domains
- →
Palo Alto Networks Certified Network Security Administrator PCNSA study guide
Full concept coverage aligned to exam objectives
- →
PCNSA practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related PCNSA practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Managing Objects practice questions
Practise PCNSA questions linked to Managing Objects.
Policy Evaluation and Management practice questions
Practise PCNSA questions linked to Policy Evaluation and Management.
Securing Traffic practice questions
Practise PCNSA questions linked to Securing Traffic.
Core Concepts practice questions
Practise PCNSA questions linked to Core Concepts.
Palo Alto Networks Platforms and Architecture practice questions
Practise PCNSA questions linked to Palo Alto Networks Platforms and Architecture.
Device Management and Services practice questions
Practise PCNSA questions linked to Device Management and Services.
App-ID and Content-ID practice questions
Practise PCNSA questions linked to App-ID and Content-ID.
Decryption and Monitoring practice questions
Practise PCNSA questions linked to Decryption and Monitoring.
PCNSA fundamentals practice questions
Practise PCNSA questions linked to PCNSA fundamentals.
PCNSA scenario practice questions
Practise PCNSA questions linked to PCNSA scenario.
PCNSA troubleshooting practice questions
Practise PCNSA questions linked to PCNSA troubleshooting.
Practice this exam
Start a free PCNSA practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Questions learners often ask
What does this PCNSA question test?
Core Concepts — This question tests Core Concepts — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: The zone protection profile has Flood Protection thresholds set too low, causing legitimate traffic to be dropped. — Option A is correct because the zone protection profile's Flood Protection can erroneously block legitimate traffic if threshold values are too low. Option B is wrong because logging profiles do not affect traffic flow. Option C is wrong because schedule settings would either allow or deny traffic at certain times, but the policy is set to allow always. Option D is wrong because the zone protection profile with Flood Protection is the most likely cause, not the security policy itself.
What should I do if I get this PCNSA question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related PCNSA ACL questions on filtering logic and placement.
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?
Standard ACLs match source addresses.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jun 24, 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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.