Google PCA Design for security and compliance Practice Question
This PCA practice question tests your understanding of design for security and compliance. 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 company uses Google Cloud Armor to protect their HTTP load balancer from OWASP Top 10 attacks. After deploying a security policy with pre-configured WAF rules, they notice that some legitimate user requests are being blocked because they match a rule incorrectly. The security team wants to fine-tune the rules to reduce false positives while maintaining strong protection. They also want to evaluate the impact of changes before enforcing them. What should they do?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Set the WAF rules to 'preview' mode to test their impact without blocking traffic, then adjust thresholds or exclusions based on logs.
Option A is correct because Cloud Armor allows setting a rule to 'preview' mode, which logs matched requests without blocking them. This enables analysis of rule effectiveness before enforcement. Option B is wrong because adding a higher priority allow rule could bypass security. Option C is wrong because rate limiting does not address WAF false positives. Option D is wrong because disabling WAF removes protection entirely.
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.
✗
Disable the WAF rules entirely and implement IP-based allowlists.
Why it's wrong here
This removes protection and is not scalable for public applications.
✓
Set the WAF rules to 'preview' mode to test their impact without blocking traffic, then adjust thresholds or exclusions based on logs.
Why this is correct
Preview mode allows safe testing of rule modifications without disrupting legitimate traffic.
Related concept
Standard ACLs match source addresses.
✗
Add a higher priority allow rule to permit the traffic that is being incorrectly blocked.
Why it's wrong here
This could inadvertently allow malicious traffic that matches the same pattern.
✗
Remove the WAF rules and rely solely on rate limiting to protect the application.
Why it's wrong here
Rate limiting does not prevent application-level attacks like SQL injection.
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 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. 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. 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.
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 PCA ACL questions on filtering logic and placement.
Design for security and compliance — This question tests Design for security and compliance — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Set the WAF rules to 'preview' mode to test their impact without blocking traffic, then adjust thresholds or exclusions based on logs. — Option A is correct because Cloud Armor allows setting a rule to 'preview' mode, which logs matched requests without blocking them. This enables analysis of rule effectiveness before enforcement. Option B is wrong because adding a higher priority allow rule could bypass security. Option C is wrong because rate limiting does not address WAF false positives. Option D is wrong because disabling WAF removes protection entirely.
What should I do if I get this PCA 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 PCA ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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