The answer is to create a custom sensitive info type with a regex pattern and keyword list. This is correct because Microsoft Purview allows you to define pattern-based detection for credit card numbers using a regular expression, while a keyword list adds contextual accuracy by requiring specific terms like “card” or “credit” to appear nearby, reducing false positives. On the Microsoft Cybersecurity Architect exam, this scenario tests your understanding of how sensitive info types drive classification before any retention or DLP actions can occur—a common trap is confusing the classification step with the enforcement step, such as thinking a DLP policy or trainable classifier handles the pattern matching. Remember that trainable classifiers use machine learning, not fixed regex, and retention labels are applied after classification, not during. A helpful memory tip: “Regex and keywords first, labels and policies later.”
SC-100 Practice Question: Design security operations, identity, and compliance capabilities
This SC-100 practice question tests your understanding of design security operations, identity, and compliance capabilities. 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 multinational company uses Microsoft Purview for data governance. They need to automatically classify sensitive data in Microsoft 365 and apply retention labels. The solution must use pattern-based detection for credit card numbers and support custom keywords. What should they configure?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a custom sensitive info type with a regex pattern and keyword list.
Option D is correct because sensitive info types can be custom-defined with patterns and keywords. Option A is wrong because retention labels are applied after classification. Option B is wrong because trainable classifiers use machine learning, not fixed patterns. Option C is wrong because DLP policies enforce actions but don't classify.
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 trainable classifier for credit card numbers.
Why it's wrong here
Trainable classifiers learn from examples, not fixed patterns.
✓
Create a custom sensitive info type with a regex pattern and keyword list.
Why this is correct
Custom sensitive info types allow pattern-based detection and custom keywords.
Related concept
Static NAT maps one inside address to one outside address.
✗
Configure a DLP policy with a rule for credit card numbers.
Why it's wrong here
DLP policies enforce actions but rely on existing sensitive info types.
✗
Create a retention label with auto-labeling policy.
Why it's wrong here
Retention labels require existing classification to apply automatically.
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 SC-100 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 SC-100 NAT questions on configuration and troubleshooting.
Design security operations, identity, and compliance capabilities — This question tests Design security operations, identity, and compliance capabilities — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Create a custom sensitive info type with a regex pattern and keyword list. — Option D is correct because sensitive info types can be custom-defined with patterns and keywords. Option A is wrong because retention labels are applied after classification. Option B is wrong because trainable classifiers use machine learning, not fixed patterns. Option C is wrong because DLP policies enforce actions but don't classify.
What should I do if I get this SC-100 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 SC-100 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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