PCNE Implementing network security Practice Question
This PCNE practice question tests your understanding of implementing network security. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 company uses Cloud Armor to protect an HTTPS Load Balancer. They notice that legitimate traffic from a specific geographic region is being blocked. The security policy has a deny rule for that region. What is the correct way to allow traffic from that region while still protecting against attacks?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Add a new allow rule for that region with a lower priority number than the deny rule
Cloud Armor security rules are evaluated in order of priority, where a lower priority number means higher precedence. To allow traffic from a specific region that is currently blocked by a deny rule, you must add an allow rule with a lower priority number (e.g., 100) than the deny rule (e.g., 1000). This ensures the allow rule is evaluated first, permitting the legitimate traffic before the deny rule can block it, while the deny rule still protects against attacks from other regions.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Remove the deny rule for that region and rely on other security measures
Why it's wrong here
This would remove protection for that region entirely.
✓
Add a new allow rule for that region with a lower priority number than the deny rule
Why this is correct
Lower priority number means higher precedence, so the allow rule will be evaluated first.
Related concept
Read the scenario before looking for a memorised answer.
✗
Remove all rules and add a single allow rule for the legitimate region
Why it's wrong here
This would remove all other security rules.
✗
Reorder the rules so that the deny rule is at the bottom of the list
Why it's wrong here
Reordering does not change priority; only the priority number matters.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that reordering rules in the list (like moving the deny rule to the bottom) changes evaluation order, but Cloud Armor strictly uses priority numbers, not list order, to determine which rule is evaluated first.
Detailed technical explanation
How to think about this question
Cloud Armor security policies use a priority-based evaluation system where rules with lower priority numbers (e.g., 100) are evaluated before those with higher numbers (e.g., 1000). The first matching rule determines the action (allow or deny), and subsequent rules are skipped. This allows granular control, such as allowing specific IP ranges or geographic regions while denying all others, by placing more specific allow rules with lower priority numbers above broader deny rules. In a real-world scenario, you might have a deny rule for a region to block known attack sources, but then add an allow rule with a lower priority for a specific IP range within that region that belongs to a trusted partner.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Implementing network security — This question tests Implementing network security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Add a new allow rule for that region with a lower priority number than the deny rule — Cloud Armor security rules are evaluated in order of priority, where a lower priority number means higher precedence. To allow traffic from a specific region that is currently blocked by a deny rule, you must add an allow rule with a lower priority number (e.g., 100) than the deny rule (e.g., 1000). This ensures the allow rule is evaluated first, permitting the legitimate traffic before the deny rule can block it, while the deny rule still protects against attacks from other regions.
What should I do if I get this PCNE question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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