This AZ-500 practice question tests your understanding of secure networking. 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.
You have an Azure Application Gateway v2 with WAF policy in prevention mode to protect a web app. Users report that legitimate requests are being blocked. You review the WAF logs and see many false positives. You need to resolve this while maintaining security. What should you do?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use managed rule sets with custom rules to allow the legitimate traffic that is being falsely blocked.
Option D is correct because using managed rule sets with custom rules to allow legitimate traffic is the best practice. Option A is wrong because disabling the WAF removes protection. Option B is wrong because detection mode only logs, not blocks, which may be a temporary solution but does not fine-tune rules. Option C is wrong because creating custom rules to block all requests is too restrictive.
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.
✗
Add a custom rule to block all requests that do not match a known pattern.
Why it's wrong here
This would block legitimate traffic that does not match the pattern.
✓
Use managed rule sets with custom rules to allow the legitimate traffic that is being falsely blocked.
Why this is correct
Custom rules can override managed rules to whitelist specific requests.
Related concept
Static NAT maps one inside address to one outside address.
Detection mode only logs but does not block, leaving the app exposed.
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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-500 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 AZ-500 NAT questions on configuration and troubleshooting.
Secure networking — This question tests Secure networking — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Use managed rule sets with custom rules to allow the legitimate traffic that is being falsely blocked. — Option D is correct because using managed rule sets with custom rules to allow legitimate traffic is the best practice. Option A is wrong because disabling the WAF removes protection. Option B is wrong because detection mode only logs, not blocks, which may be a temporary solution but does not fine-tune rules. Option C is wrong because creating custom rules to block all requests is too restrictive.
What should I do if I get this AZ-500 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 AZ-500 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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