Google PCA Manage implementation of cloud architecture Practice Question
This PCA practice question tests your understanding of manage implementation of cloud architecture. 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 is using Cloud Armor to protect their external HTTPS load balancer. They want to block traffic from a specific list of IP ranges. They create a security policy with a deny rule. However, the denials seem not to be applied to all backend services. 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 security policy is attached to the load balancer's target proxy, but the deny rule priority is lower than an allow rule
Cloud Armor security policies are evaluated against the rules in priority order, with lower numbers having higher priority. If a deny rule has a higher priority number (lower priority) than an allow rule, the allow rule will be evaluated first and permit the traffic, effectively overriding the deny. The most likely cause is that the deny rule's priority is not set lower than any conflicting allow rules, so the allow rule matches first.
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.
✗
The security policy is not attached to the backend service
Why it's wrong here
If not attached, no rules apply, but the question implies some effect.
✓
The security policy is attached to the load balancer's target proxy, but the deny rule priority is lower than an allow rule
Why this is correct
Rules evaluated by priority; higher priority allow rule can override lower priority deny rule.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Cloud Armor policies only apply to global load balancers, not regional
Why it's wrong here
Cloud Armor supports both global and regional load balancers.
✗
The security policy has an allow rule that overrides the deny rule
Why it's wrong here
Partially correct but not as precise as priority order.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that simply having a deny rule in a security policy is sufficient, without understanding that rule priority determines which rule is evaluated first, and an allow rule with lower priority number can override a deny rule.
Detailed technical explanation
How to think about this question
Cloud Armor security policies use a priority-based rule evaluation model where the rule with the lowest priority number (highest precedence) that matches the traffic is applied. If an allow rule with priority 1000 exists and a deny rule with priority 2000, the allow rule will match first and permit the traffic, making the deny rule ineffective. This is analogous to firewall rule ordering in GCP VPC firewall policies, where explicit denies must have higher priority than allows to block traffic.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this PCA question in full detail.
Manage implementation of cloud architecture — This question tests Manage implementation of cloud architecture — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The security policy is attached to the load balancer's target proxy, but the deny rule priority is lower than an allow rule — Cloud Armor security policies are evaluated against the rules in priority order, with lower numbers having higher priority. If a deny rule has a higher priority number (lower priority) than an allow rule, the allow rule will be evaluated first and permit the traffic, effectively overriding the deny. The most likely cause is that the deny rule's priority is not set lower than any conflicting allow rules, so the allow rule matches first.
What should I do if I get this PCA question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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?
Read the scenario before looking for a memorised answer.
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Question Discussion
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