PCNSA Policy Evaluation and Management Practice Question
An administrator needs to allow a specific set of external IP addresses to access an internal web server on port 443, but all other traffic to that server must be blocked. The administrator creates a security policy rule that allows the specific IP addresses and places it at the bottom of the rulebase. What will be the result?
⚠ Common exam trap
The trap here is assuming that rule order does not matter as long as the correct rule exists, when in fact a more general rule above can shadow a specific rule below.
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 rule will be evaluated last, and if no other rule matches, the specific IP addresses will be allowed and all others will be blocked by the implicit deny.
Security rules are evaluated from top to bottom. Placing a specific allow rule at the bottom means it will be evaluated after any earlier rules. If no earlier rule matches, the specific IP addresses will be allowed, and all other traffic will be blocked by the implicit deny. However, best practice is to place more specific rules above more general ones to ensure they are hit first.
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 will be ignored because the implicit deny rule at the top blocks all traffic first.
Why it's wrong here
The implicit deny rule is at the bottom of the rulebase, not the top. It only applies if no other rule matches. Therefore, the specific allow rule will be evaluated before the implicit deny. This option misplaces the implicit deny and incorrectly states that the allow rule is ignored.
- ✗
The rule will allow the specific IP addresses but also allow all other traffic because the implicit deny is overridden.
Why it's wrong here
The implicit deny is a default rule that blocks all traffic not explicitly allowed. It is not overridden by adding an allow rule; rather, the allow rule only permits specified traffic. All other traffic still hits the implicit deny and is blocked. This option misunderstands the function of the implicit deny rule.
- ✗
The rule will not be evaluated because rules are processed in alphabetical order.
Why it's wrong here
Security rules are evaluated top-down based on their position in the rulebase, not alphabetically. Placing the rule at the bottom means it will be evaluated after all other rules. If a more general rule above it permits the traffic, the specific rule may never be reached, defeating its purpose. This option incorrectly describes the evaluation order.
- ✓
The rule will be evaluated last, and if no other rule matches, the specific IP addresses will be allowed and all others will be blocked by the implicit deny.
Why this is correct
Rules are evaluated top-down. If the allow rule is at the bottom, any traffic not matching earlier rules will eventually hit this rule. The specific IP addresses will be allowed, and all other traffic will fall through to the implicit deny at the end of the rulebase. This achieves the desired outcome, but it is not the most efficient placement because earlier rules might inadvertently match.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Palo Alto Networks exam blueprint
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.