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Policy Evaluation and Management →mediumMultiple ChoiceObjective-mapped

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 network administrator notices that traffic from a specific subnet is being denied even though there is a permit rule that matches the source and destination. The rulebase has over 500 rules. 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.

A
The destination NAT is causing asymmetric routing.
Why wrong: NAT issues do not cause policy denials.
B
The rule is too far down in the rulebase and a previous implicit deny is blocking.
Why wrong: Implicit deny is only at the end, so a rule above would need to match.
C
A previous rule with a broader match is denying the traffic before reaching the permit rule.
A rule with deny and broader match earlier in rulebase will block traffic.
D
The application override is misconfigured.
Why wrong: Application override does not cause denials.

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

✓

A previous rule with a broader match is denying the traffic before reaching the permit rule.

Option C is correct because in a firewall rulebase, rules are evaluated from top to bottom. If a previous rule with a broader match denies the traffic, it will be blocked before reaching the permit rule lower in the list. Option B is incorrect because the implicit deny is only at the end of the rulebase; there is no implicit deny earlier. Options A and D are unrelated to the scenario: asymmetric routing from destination NAT and misconfigured application override do not cause denial when a matching permit rule exists.

Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.

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 destination NAT is causing asymmetric routing.
Why it's wrong here
NAT issues do not cause policy denials.
✗
The rule is too far down in the rulebase and a previous implicit deny is blocking.
Why it's wrong here
Implicit deny is only at the end, so a rule above would need to match.
✓
A previous rule with a broader match is denying the traffic before reaching the permit rule.
Why this is correct
A rule with deny and broader match earlier in rulebase will block traffic.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
CIDR notation defines the prefix length.
✗
The application override is misconfigured.
Why it's wrong here
Application override does not cause denials.

Common exam traps

Common exam trap: usable hosts are not the same as total addresses

Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.

Detailed technical explanation

How to think about this question

Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.

KKey Concepts to Remember

CIDR notation defines the prefix length.
Block size helps identify subnet boundaries.
Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
The required host count determines the smallest suitable subnet.

TExam Day Tips

Write the block size before choosing the subnet.
Check whether the question asks for hosts, subnets or a specific address range.
Do not confuse /24, /25, /26 and /27 host counts.

Key takeaway

Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.

Real-world example

How this comes up in practice

A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.

Visual reference

Quick reference

Asymmetric Encryption Algorithm Comparison

Algorithm	Key Exchange	Signatures	Equivalent Security Key	Notes
RSA-3072	Yes	Yes	128-bit	Widely deployed; slow for bulk data
ECDSA P-256	No	Yes	128-bit	Fast signatures; standard TLS certs
ECDH / ECDHE	Yes	No	128-bit	Perfect forward secrecy in TLS 1.3
DH / DHE	Yes	No	128-bit (3072-bit key)	Replaced by ECDHE in modern TLS
Ed25519	No	Yes	~128-bit	SSH keys, modern PKI

What to study next

Got this wrong? Here's your next step.

Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related PCNSA subnetting questions on CIDR, address ranges, and subnet selection.

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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 — CIDR notation defines the prefix length..

What is the correct answer to this question?

The correct answer is: A previous rule with a broader match is denying the traffic before reaching the permit rule. — Option C is correct because in a firewall rulebase, rules are evaluated from top to bottom. If a previous rule with a broader match denies the traffic, it will be blocked before reaching the permit rule lower in the list. Option B is incorrect because the implicit deny is only at the end of the rulebase; there is no implicit deny earlier. Options A and D are unrelated to the scenario: asymmetric routing from destination NAT and misconfigured application override do not cause denial when a matching permit rule exists.

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?

CIDR notation defines the prefix length.

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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.