The answer is a misconfigured source zone or address. This is the most likely cause because a security rule will only match traffic if all specified conditions—including source zone, source address, destination, and application—are satisfied; if the engineering department’s traffic originates from a different zone or IP range than what the rule defines, the rule is effectively invisible to that traffic, causing it to fall through to the default deny rule below. On the PCNSA exam, this question tests your understanding of rule-matching fundamentals and the common trap of assuming correct rule placement alone guarantees a match, when in fact zone and address misalignment is the primary reason a rule fails to trigger. A helpful memory tip is to think of the rule as a locked door: even if the door is in the right spot (rule order), it won’t open unless the key (source zone/address) fits.
PCNSA Policy Evaluation and Management Practice Question
This PCNSA practice question tests your understanding of policy evaluation and management. 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 security administrator notices that a newly added security rule, designed to allow SSH traffic from the engineering department to a Linux server, is not being matched. The rule is placed above an existing 'deny all' rule. What is the most likely cause?
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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The rule's source zone or address does not match the engineering department traffic.
Option B is correct because if the zone or source address is misconfigured, the traffic will not match the intended rule and will be matched by later rules. Option A is wrong because rule ordering is correct (rule above deny all). Option C is wrong because hit count is irrelevant to the cause of no match. Option D is wrong because the rule is placed in the correct position.
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 rule is placed below the deny all rule.
Why it's wrong here
The rule is placed above the deny all rule, so order is fine.
✓
The rule's source zone or address does not match the engineering department traffic.
Why this is correct
Misconfigured source zones or addresses prevent the rule from matching the intended traffic.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
✗
The rule has a low hit count.
Why it's wrong here
Hit count indicates usage, not why the rule does not match.
✗
The rule is placed after the deny all rule.
Why it's wrong here
The rule is placed before the deny all rule.
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: The rule's source zone or address does not match the engineering department traffic. — Option B is correct because if the zone or source address is misconfigured, the traffic will not match the intended rule and will be matched by later rules. Option A is wrong because rule ordering is correct (rule above deny all). Option C is wrong because hit count is irrelevant to the cause of no match. Option D is wrong because the rule is placed in the correct position.
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.
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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