The correct security improvement is to modify the linked service to use the managed identity for authentication instead of the account key. This is because a managed identity, whether system-assigned or user-assigned, eliminates the need to store any credentials or secrets in connection strings, directly leveraging Azure AD authentication for secure, passwordless access to Azure Storage. On the DP-203 exam, this scenario tests your understanding of the principle of least privilege and the security hierarchy of authentication methods: managed identities are always preferred over account keys or even Key Vault references, as the latter still involves managing a secret. A common trap is assuming that simply enabling a managed identity on the factory or switching to Key Vault is sufficient—the exam expects you to recognize that the linked service definition itself must be reconfigured to use the identity. Remember the memory tip: “If the identity is set but not used, it’s just a decoration—change the auth, not the vault.”
DP-203 Practice Question: Secure, monitor, and optimize data storage and data processing
This DP-203 practice question tests your understanding of secure, monitor, and optimize data storage and data processing. 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.
Refer to the exhibit. You are reviewing a Data Factory JSON definition. The factory has a user-assigned managed identity configured. However, the linked service to Azure Storage uses an account key. What security improvement should you recommend?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Modify the linked service to use the managed identity for authentication
Using the managed identity instead of account key is more secure because it avoids storing secrets. Option A is wrong because the managed identity is already configured but not used. Option B is wrong because firewall rules are separate. Option D is wrong because switching to Key Vault still stores a secret; managed identity is preferred when possible.
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.
✗
Add a firewall rule to limit access to the storage account
Modify the linked service to use the managed identity for authentication
Why this is correct
Managed identity eliminates the need for account key.
Related concept
Read the scenario before looking for a memorised answer.
✗
Remove the managed identity and use a service principal
Why it's wrong here
Managed identity is already more secure than service principal (no credential management).
✗
Keep the account key but store it in Azure Key Vault
Why it's wrong here
Key Vault is better than hardcoding, but managed identity is even more secure.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this DP-203 question in full detail.
Identify which DP-203 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.
Secure, monitor, and optimize data storage and data processing — This question tests Secure, monitor, and optimize data storage and data processing — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Modify the linked service to use the managed identity for authentication — Using the managed identity instead of account key is more secure because it avoids storing secrets. Option A is wrong because the managed identity is already configured but not used. Option B is wrong because firewall rules are separate. Option D is wrong because switching to Key Vault still stores a secret; managed identity is preferred when possible.
What should I do if I get this DP-203 question wrong?
Identify which DP-203 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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