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 wants to use Cloud Armor to protect their HTTP load balancer from SQL injection attacks. Which rule action should they configure to block malicious requests?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use a pre-configured WAF rule that includes 'evaluatePreconfiguredExpr('sqli-stable')' with action 'deny(403)'.
Option B is correct because Cloud Armor's pre-configured WAF rules include 'sqli' to detect SQL injection patterns. Option A is wrong because 'deny(403)' alone does not inspect the request body. Option C is wrong because 'rateLimit' limits request rate but does not inspect for SQL injection. Option D is wrong because 'redirect' does not block.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Use a pre-configured WAF rule that includes 'evaluatePreconfiguredExpr('sqli-stable')' with action 'deny(403)'.
Why this is correct
Cloud Armor's pre-configured WAF rules detect common SQL injection signatures.
Related concept
Static NAT maps one inside address to one outside address.
✗
Configure a rate-limiting rule with action 'rateLimit' to throttle traffic from suspicious IPs.
Why it's wrong here
Rate limiting does not inspect request content for injection.
✗
Create a rule that redirects traffic to a reCAPTCHA challenge for validation.
Why it's wrong here
Redirecting does not block the request; it may still be processed.
✗
Set a security policy rule with action 'deny(403)' and a simple condition on the user-agent header.
Why it's wrong here
A simple user-agent condition does not detect SQL injection patterns.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. 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 the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PCA NAT questions on configuration and troubleshooting.
Design for security and compliance — This question tests Design for security and compliance — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Use a pre-configured WAF rule that includes 'evaluatePreconfiguredExpr('sqli-stable')' with action 'deny(403)'. — Option B is correct because Cloud Armor's pre-configured WAF rules include 'sqli' to detect SQL injection patterns. Option A is wrong because 'deny(403)' alone does not inspect the request body. Option C is wrong because 'rateLimit' limits request rate but does not inspect for SQL injection. Option D is wrong because 'redirect' does not block.
What should I do if I get this PCA question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PCA NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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