SC-100 Practice Question: Design security solutions for applications and data
This SC-100 practice question tests your understanding of design security solutions for applications and data. 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.
Your organization uses Microsoft Purview Data Loss Prevention (DLP) to protect sensitive data in Microsoft 365. You need to create a DLP policy that detects and blocks sharing of credit card numbers in Exchange Online emails. Which TWO components must you configure?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Action to block sharing
Option A is correct because a sensitive info type for credit card number is required to identify the data. Option C is correct because the action 'Block' must be set to prevent sharing. Option B is wrong because a retention label is for data retention, not DLP. Option D is wrong because trainable classifiers are for complex patterns, but credit card numbers are predefined. Option E is wrong because auto-labeling is separate from DLP.
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.
✗
Retention label for financial data
Why it's wrong here
Retention labels manage data lifecycle, not DLP actions.
✗
Auto-labeling policy
Why it's wrong here
Auto-labeling applies sensitivity labels; DLP policies use actions like block or notify.
✓
Action to block sharing
Why this is correct
The DLP policy must have an action to block the email containing credit card data.
Related concept
Static NAT maps one inside address to one outside address.
✓
Sensitive info type for credit card number
Why this is correct
The DLP rule needs a sensitive info type to detect credit card numbers.
Related concept
Static NAT maps one inside address to one outside address.
✗
Trainable classifier for credit card numbers
Why it's wrong here
Credit card numbers are predefined sensitive info types; no training needed.
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 solutions for applications and data — This question tests Design security solutions for applications and data — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Action to block sharing — Option A is correct because a sensitive info type for credit card number is required to identify the data. Option C is correct because the action 'Block' must be set to prevent sharing. Option B is wrong because a retention label is for data retention, not DLP. Option D is wrong because trainable classifiers are for complex patterns, but credit card numbers are predefined. Option E is wrong because auto-labeling is separate from DLP.
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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