- A
Create a rule that denies all traffic from Sales to Finance, and then an application default deny rule that allows ms-office365.
Why wrong: Application default deny is not a rule; it's a setting that requires explicit allow rules.
- B
Create a rule that allows all traffic from Sales to Finance, then a rule that denies ms-office365.
Why wrong: This would allow all applications except ms-office365, opposite of requirement.
- C
Create a rule that allows ms-office365 from Sales to Finance, and place a deny all rule after it.
The first rule allows the specific application, and the second deny rule blocks all other traffic.
- D
Create one rule that allows ms-office365 and denies all other traffic from Sales to Finance.
Why wrong: A single rule cannot both allow and deny; it performs one action per match.
Quick Answer
The correct answer is to create a rule that allows ms-office365 from Sales to Finance, and place a deny all rule after it. This design is efficient because Palo Alto Networks firewalls process security rules from top to bottom, matching the first applicable rule; by placing the specific allow rule first, you explicitly permit the desired application, and the subsequent deny all rule catches any remaining traffic, ensuring that only ms-office365 is allowed while all other applications are blocked. On the PCNSA exam, this scenario tests your understanding of rule ordering and the principle of least privilege, often appearing as a trap where candidates mistakenly try to combine allow and deny in a single rule or reverse the logic. A common memory tip is “allow first, deny last” — think of it as opening a specific door and locking the rest of the house.
PCNSA Policy Evaluation and Management Practice Question
This PCNSA practice question tests your understanding of policy evaluation and management. 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.
An administrator needs to implement a policy where traffic from the 'Sales' zone to the 'Finance' zone is allowed only for the 'ms-office365' application, but traffic from 'Sales' to 'Finance' using any other application must be denied. Which rule design meets this requirement efficiently?
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
Create a rule that allows ms-office365 from Sales to Finance, and place a deny all rule after it.
Option D is correct because a rule allowing the specific application and a subsequent deny rule for other traffic is the simplest and most efficient. Option A is wrong because it allows all and then denies ms-office365, which is opposite. Option B is wrong because application default deny would need explicit deny for other apps. Option C is wrong because combining allow and deny in one rule is not possible.
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.
- ✗
Create a rule that denies all traffic from Sales to Finance, and then an application default deny rule that allows ms-office365.
Why it's wrong here
Application default deny is not a rule; it's a setting that requires explicit allow rules.
- ✗
Create a rule that allows all traffic from Sales to Finance, then a rule that denies ms-office365.
Why it's wrong here
This would allow all applications except ms-office365, opposite of requirement.
- ✓
Create a rule that allows ms-office365 from Sales to Finance, and place a deny all rule after it.
Why this is correct
The first rule allows the specific application, and the second deny rule blocks all other traffic.
Related concept
Standard ACLs match source addresses.
- ✗
Create one rule that allows ms-office365 and denies all other traffic from Sales to Finance.
Why it's wrong here
A single rule cannot both allow and deny; it performs one action per match.
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.
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Policy Evaluation and Management — study guide chapter
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Policy Evaluation and Management practice questions
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FAQ
Questions learners often ask
What does this PCNSA question test?
Policy Evaluation and Management — This question tests Policy Evaluation and Management — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Create a rule that allows ms-office365 from Sales to Finance, and place a deny all rule after it. — Option D is correct because a rule allowing the specific application and a subsequent deny rule for other traffic is the simplest and most efficient. Option A is wrong because it allows all and then denies ms-office365, which is opposite. Option B is wrong because application default deny would need explicit deny for other apps. Option C is wrong because combining allow and deny in one rule is not possible.
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.
What is the key concept behind this question?
Standard ACLs match source addresses.
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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.
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