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Question 43 of 529

Policy Evaluation and Management →hardMultiple ChoiceObjective-mapped

PCNSA Policy Evaluation and Management Practice Question

This PCNSA practice question tests your understanding of policy evaluation and management. 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.

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?

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.

Full breakdown with real-world context →

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 C is correct because in Palo Alto firewalls, security rules are either allow or deny, not both. To allow only 'ms-office365' and deny all other traffic from Sales to Finance, you create an allow rule for that application, followed by a deny-all rule for the same source/destination. This ensures efficiency by allowing the specific traffic first, then blocking everything else. Option A is incorrect as it uses a deny-all first, then tries to allow with an application default deny, which is not a valid concept and would require an explicit allow rule. Option B is incorrect because allowing all traffic and then denying the specific application defeats the purpose. Option D is invalid because a single rule cannot contain both allow and deny actions.

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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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 C is correct because in Palo Alto firewalls, security rules are either allow or deny, not both. To allow only 'ms-office365' and deny all other traffic from Sales to Finance, you create an allow rule for that application, followed by a deny-all rule for the same source/destination. This ensures efficiency by allowing the specific traffic first, then blocking everything else. Option A is incorrect as it uses a deny-all first, then tries to allow with an application default deny, which is not a valid concept and would require an explicit allow rule. Option B is incorrect because allowing all traffic and then denying the specific application defeats the purpose. Option D is invalid because a single rule cannot contain both allow and deny actions.

What should I do if I get this PCNSA question wrong?

What is the key concept behind this question?

Standard ACLs match source addresses.

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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.