The correct answer is enabling TLS inspection and IDPS (Intrusion Detection and Prevention System). TLS inspection is required because PCI DSS mandates that all traffic, including encrypted HTTPS, must be inspected for malicious content to protect cardholder data, and Azure Firewall Premium decrypts and re-encrypts this traffic for deep packet inspection. IDPS meets the PCI DSS requirement for an intrusion detection and prevention system by using signature-based detection to identify and block threats in real time. On the AZ-500 exam, this question tests your understanding of which Azure Firewall Premium features directly satisfy specific compliance controls, often appearing as a multi-select scenario where you must distinguish mandatory security features from optional networking tools. A common trap is confusing URL filtering or DNS proxy with compliance requirements, but remember that PCI DSS focuses on inspecting encrypted traffic and detecting intrusions, not on web categorization or name resolution. Memory tip: think “TLS + IDPS = PCI DSS” — the two features that decrypt and detect.
AZ-500 Secure networking Practice Question
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.
A company uses Azure Firewall Premium to inspect outbound traffic. They want to deploy a web application that must comply with the Payment Card Industry Data Security Standard (PCI DSS). Which TWO capabilities should be enabled to meet PCI DSS requirements for network security?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Intrusion Detection and Prevention System (IDPS)
Options A and D are correct. TLS inspection allows the firewall to decrypt and inspect HTTPS traffic, which is often required for compliance. IDPS provides signature-based detection of threats, meeting the requirement for intrusion detection/prevention. Option B is wrong because DNS proxy is not a PCI DSS requirement. Option C is wrong because URL filtering is about web categories, not specifically required by PCI DSS. Option E is wrong because SNAT is a function of NAT, not a compliance feature.
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.
✓
Intrusion Detection and Prevention System (IDPS)
Why this is correct
PCI DSS requires a network intrusion detection/prevention system.
Related concept
Static NAT maps one inside address to one outside address.
✓
TLS inspection
Why this is correct
PCI DSS requires inspection of encrypted traffic to prevent attacks.
Related concept
Static NAT maps one inside address to one outside address.
✗
URL filtering
Why it's wrong here
URL filtering is useful but not a specific PCI DSS requirement.
SNAT is a NAT feature, not a security requirement.
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: Intrusion Detection and Prevention System (IDPS) — Options A and D are correct. TLS inspection allows the firewall to decrypt and inspect HTTPS traffic, which is often required for compliance. IDPS provides signature-based detection of threats, meeting the requirement for intrusion detection/prevention. Option B is wrong because DNS proxy is not a PCI DSS requirement. Option C is wrong because URL filtering is about web categories, not specifically required by PCI DSS. Option E is wrong because SNAT is a function of NAT, not a compliance feature.
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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