The answer is a managed identity assigned to the Data Factory and a service principal. These two methods are correct because they follow Azure’s best practice of using identity-based authentication rather than static secrets. A managed identity eliminates the need to store credentials by tying the Data Factory’s identity directly to Azure AD, while a service principal allows you to grant granular RBAC permissions to a dedicated app registration. On the DP-203 exam, this question tests your understanding of secure authentication patterns for Azure Data Factory pipelines accessing ADLS Gen2, often appearing as a multiple-select trap where storage account keys and SAS tokens are plausible but incorrect due to security and lifecycle management concerns. Remember, Azure recommends identity over keys: think “MI and SP” (Managed Identity and Service Principal) as the secure pair, and avoid anything that involves a shared secret or expiration date.
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. 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.
Which TWO methods can you use to authenticate an Azure Data Factory pipeline to access Azure Data Lake Storage Gen2? (Choose TWO)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use a service principal with a client secret or certificate.
Correct answers: A and C. A: Managed identity is a recommended method for Azure services. C: Service principal is another common method. B is wrong because storage account key is not recommended for production due to security risks. D is wrong because SAS tokens are less secure and have expiration. E is wrong because user password is not supported.
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 service principal with a client secret or certificate.
Why this is correct
Service principal is a standard authentication method.
Related concept
Static NAT maps one inside address to one outside address.
✗
Use a shared access signature (SAS) token.
Why it's wrong here
SAS tokens are less secure and require management.
✓
Use a managed identity assigned to the Data Factory.
Why this is correct
Managed identity provides secure authentication without managing credentials.
Related concept
Static NAT maps one inside address to one outside address.
✗
Use a user account with password.
Why it's wrong here
User accounts are not supported for service-to-service authentication.
✗
Use the storage account access key.
Why it's wrong here
Access keys are not recommended due to security concerns.
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 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.
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 DP-203 NAT questions on configuration and troubleshooting.
Secure, monitor, and optimize data storage and data processing — This question tests Secure, monitor, and optimize data storage and data processing — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Use a service principal with a client secret or certificate. — Correct answers: A and C. A: Managed identity is a recommended method for Azure services. C: Service principal is another common method. B is wrong because storage account key is not recommended for production due to security risks. D is wrong because SAS tokens are less secure and have expiration. E is wrong because user password is not supported.
What should I do if I get this DP-203 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 DP-203 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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