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Core Concepts →mediumMultiple ChoiceObjective-mapped

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.

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.

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

✓

The zone protection profile has Flood Protection thresholds set too low, causing legitimate traffic to be dropped.

The zone protection profile with Flood Protection can drop traffic that exceeds configured thresholds. If the thresholds are set too low, legitimate traffic may be mistaken for a flood and denied, even though a security policy allows it. This is the most likely cause of the denial. Option A is incorrect because the security policy allowing all outbound traffic overrides the implicit deny rule when a match occurs. Option C is incorrect because logging profiles do not affect traffic flow; they only control logging. Option D is incorrect because if a schedule were restricting access, the policy would not be active at the current time, but the question states the policy allows all outbound traffic, implying no schedule restriction.

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.

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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. — The zone protection profile with Flood Protection can drop traffic that exceeds configured thresholds. If the thresholds are set too low, legitimate traffic may be mistaken for a flood and denied, even though a security policy allows it. This is the most likely cause of the denial. Option A is incorrect because the security policy allowing all outbound traffic overrides the implicit deny rule when a match occurs. Option C is incorrect because logging profiles do not affect traffic flow; they only control logging. Option D is incorrect because if a schedule were restricting access, the policy would not be active at the current time, but the question states the policy allows all outbound traffic, implying no schedule restriction.

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

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.

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