The answer is to create a rate-limiting rule. Microsoft Defender for APIs enables you to block a specific IP address by configuring a rate-limiting rule, which can set a threshold of zero requests to effectively deny all traffic from that address for a defined duration, such as 24 hours. On the Microsoft Cybersecurity Architect exam, this question tests your understanding of Defender for APIs’ built-in security controls, specifically how to enforce temporary IP blocks without modifying network infrastructure. A common trap is confusing rate limiting with API schema validation, which only checks request structure, or with authentication settings, which manage token verification. Remember the memory tip: “Rate limit to block, schema to check, auth to verify”—this helps you distinguish the purpose of each control when you need to block an IP address in Microsoft Defender for APIs.
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.
A retail company uses Microsoft Defender for APIs to protect its online store API. The security team notices unusual API calls from an IP address that is not in the allowed list. They want to block this IP address for 24 hours. 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 rate-limiting rule
Option A is correct because Defender for APIs allows creating a rate-limiting rule to block an IP. Option B is wrong because API schema validation validates request structure, not blocks IPs. Option C is wrong because authentication settings verify tokens. Option D is wrong because API collections group APIs.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Configure API schema validation
Why it's wrong here
Schema validation ensures requests match the expected schema, it does not block IPs.
✗
Modify the authentication settings
Why it's wrong here
Authentication settings manage how requests are authenticated, not IP blocking.
✗
Update the API collection
Why it's wrong here
API collections are logical groupings, not security controls.
✓
Create a rate-limiting rule
Why this is correct
Rate-limiting rules can block specific IP addresses for a defined period.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this SC-100 question in full detail.
Identify which SC-100 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Design security solutions for applications and data — This question tests Design security solutions for applications and data — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create a rate-limiting rule — Option A is correct because Defender for APIs allows creating a rate-limiting rule to block an IP. Option B is wrong because API schema validation validates request structure, not blocks IPs. Option C is wrong because authentication settings verify tokens. Option D is wrong because API collections group APIs.
What should I do if I get this SC-100 question wrong?
Identify which SC-100 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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