The correct answer is to enable a system-assigned managed identity on the Stream Analytics job and configure the output to use it. This works because managed identities provide Azure services with an automatically managed identity in Azure AD, allowing the Stream Analytics job to authenticate to Azure Synapse without storing credentials or connection strings. When you enable the system-assigned identity, Azure creates a service principal for the job, and you then grant that principal the appropriate SQL permissions (e.g., as a user with db_datareader/writer roles) within the Synapse workspace. On the DP-203 exam, this scenario tests your understanding of secure, passwordless authentication patterns between Azure data services—a common trap is assuming you must use a user-assigned identity or SQL authentication, but the system-assigned option is simpler and fully supported. Remember the memory tip: "System for Stream" — when authenticating Stream Analytics to Synapse, always start with the system-assigned identity before considering alternatives.
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.
You have an Azure Stream Analytics job that writes output to Azure Synapse Analytics. You need to ensure that the job can authenticate to Synapse Analytics using a managed identity. What should you do?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable system-assigned managed identity on the Stream Analytics job and configure the output to use it.
Option C is correct because Stream Analytics jobs can use managed identity to authenticate to Azure Synapse Analytics. Option A is wrong because connection strings with SQL authentication are not managed identity. Option B is wrong because system-assigned managed identity is enabled automatically, but the output configuration must be set to use it. Option D is wrong because a user-assigned managed identity is not required; system-assigned can be used.
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.
✓
Enable system-assigned managed identity on the Stream Analytics job and configure the output to use it.
Why this is correct
This is the correct method to use managed identity for authentication.
Related concept
Static NAT maps one inside address to one outside address.
✗
Generate a shared access signature (SAS) token for the Synapse Analytics workspace.
Why it's wrong here
SAS tokens are not used for Synapse Analytics authentication from Stream Analytics.
✗
Create a user-assigned managed identity and assign it to the Stream Analytics job.
Why it's wrong here
While possible, system-assigned managed identity is simpler and sufficient.
✗
Configure the output to use SQL Server authentication with a username and password.
Why it's wrong here
This is not managed identity authentication.
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 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 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: Enable system-assigned managed identity on the Stream Analytics job and configure the output to use it. — Option C is correct because Stream Analytics jobs can use managed identity to authenticate to Azure Synapse Analytics. Option A is wrong because connection strings with SQL authentication are not managed identity. Option B is wrong because system-assigned managed identity is enabled automatically, but the output configuration must be set to use it. Option D is wrong because a user-assigned managed identity is not required; system-assigned can be used.
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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