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Policy Evaluation and Management →easyMultiple ChoiceObjective-mapped

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.

A small business has a Palo Alto Networks firewall with a single security policy rule that allows all traffic from the 'Trust' zone to the 'Untrust' zone. The business recently experienced a malware infection originating from an internal host that communicated with known malicious IP addresses. The administrator wants to implement a security policy to block traffic to these malicious IP destinations. The administrator has a list of 500 malicious IP addresses that may change frequently. What is the most efficient way to create a policy to block traffic to these IPs?

A
Create a security rule with an address group containing the 500 IPs as destination, action deny, placed above the allow rule.
Why wrong: Incorrect. Address groups are better than individual objects, but still require manual updates. An EDL is more efficient for dynamic lists.
B
Create a security rule with source zone Trust, destination zone Untrust, source address list containing the 500 IPs, action deny.
Why wrong: Incorrect. The source address should be Trust zone, but the malicious IPs are destinations, not sources.
C
Create an External Dynamic List (EDL) of the malicious IPs and reference it in a security rule as destination address, with action deny, placed above the allow rule.
Correct. EDLs simplify management and allow automatic updates, making them the most efficient choice for frequently changing lists.
D
Create a security rule with source zone Trust, destination zone Untrust, destination address list containing the 500 IPs as separate address objects, action deny, placed above the allow rule.
Why wrong: Incorrect. Adding 500 individual objects is inefficient and hard to maintain.

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 an External Dynamic List (EDL) of the malicious IPs and reference it in a security rule as destination address, with action deny, placed above the allow rule.

External Dynamic Lists (EDLs) are designed to manage large, frequently updated lists of IP addresses. They integrate with security rules and can be updated automatically, minimizing administrative overhead.

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 security rule with an address group containing the 500 IPs as destination, action deny, placed above the allow rule.
Why it's wrong here
Incorrect. Address groups are better than individual objects, but still require manual updates. An EDL is more efficient for dynamic lists.
✗
Create a security rule with source zone Trust, destination zone Untrust, source address list containing the 500 IPs, action deny.
Why it's wrong here
Incorrect. The source address should be Trust zone, but the malicious IPs are destinations, not sources.
✓
Create an External Dynamic List (EDL) of the malicious IPs and reference it in a security rule as destination address, with action deny, placed above the allow rule.
Why this is correct
Correct. EDLs simplify management and allow automatic updates, making them the most efficient choice for frequently changing lists.
Related concept
Standard ACLs match source addresses.
✗
Create a security rule with source zone Trust, destination zone Untrust, destination address list containing the 500 IPs as separate address objects, action deny, placed above the allow rule.
Why it's wrong here
Incorrect. Adding 500 individual objects is inefficient and hard to maintain.

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 an External Dynamic List (EDL) of the malicious IPs and reference it in a security rule as destination address, with action deny, placed above the allow rule. — External Dynamic Lists (EDLs) are designed to manage large, frequently updated lists of IP addresses. They integrate with security rules and can be updated automatically, minimizing administrative overhead.

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.