PCNSA Policy Evaluation and Management Practice Question
This PCNSA practice question tests your understanding of policy evaluation and management. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 apply a security profile that includes anti-malware and vulnerability protection to all traffic from the internal network to the internet. However, there is already a rule that allows this traffic without any profiles. What is the most efficient way to apply the profiles?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a new rule above the existing rule with the profiles and action 'allow', and ensure the rule is before the existing allow rule.
Option C is correct because creating a new rule above the existing rule with the profiles and action 'allow' will match first and enforce the profiles without modifying the existing rule. Option A is also possible but less efficient if the existing rule is complex. Option B would block traffic. Option D is disruptive.
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 new rule above the existing rule with the profiles and action 'deny'.
Why it's wrong here
Deny action would block traffic, not inspect.
✗
Remove the existing rule and replace it with a new rule that includes the profiles.
Why it's wrong here
Removing the existing rule could cause service disruption if not done carefully.
✓
Create a new rule above the existing rule with the profiles and action 'allow', and ensure the rule is before the existing allow rule.
Why this is correct
This ensures the new rule matches first and applies profiles.
Related concept
Standard ACLs match source addresses.
✗
Edit the existing rule to add the security profiles.
Why it's wrong here
Editing works but may be less efficient if the rule is large or there are many rules.
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.
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 new rule above the existing rule with the profiles and action 'allow', and ensure the rule is before the existing allow rule. — Option C is correct because creating a new rule above the existing rule with the profiles and action 'allow' will match first and enforce the profiles without modifying the existing rule. Option A is also possible but less efficient if the existing rule is complex. Option B would block traffic. Option D is disruptive.
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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Question Discussion
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