The answer is an invalid Entra ID admin SID set to all zeros. This is the most likely cause of your ARM template Azure SQL Database firewall rule error because Azure SQL Database requires a valid, non-zero GUID for the Entra ID admin object ID to authenticate; when public network access is disabled, the server can be deployed without explicit firewall rules, but the invalid SID—'00000000-0000-0000-0000-000000000000'—blocks the entire deployment. On the DP-300 exam, this scenario tests your understanding that Entra ID admin configuration is a prerequisite for server creation, not just a post-deployment step, and it often appears as a trap where candidates mistakenly blame missing firewall rules. A common memory tip is to think of the SID as a key: a zeroed-out key cannot unlock authentication, so always verify the object ID is a real GUID from your Entra ID tenant.
DP-300 Plan and implement data platform resources Practice Question
This DP-300 practice question tests your understanding of plan and implement data platform resources. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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. The exhibit shows a partial ARM template for deploying an Azure SQL Database server. You run the deployment but get an error stating the server cannot be created because of a missing firewall rule. The template has public network access disabled and no firewall rules defined. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The Entra ID admin SID is invalid (all zeros).
The error occurs because the Entra ID admin SID is set to all zeros ('00000000-0000-0000-0000-000000000000'), which is an invalid GUID. Azure SQL Database requires a valid, non-zero SID (object ID) for the Entra ID admin to establish authentication. When public network access is disabled, the server can still be created without firewall rules, but the invalid SID prevents the deployment from succeeding.
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.
✗
The firewallRules array must include at least one rule when publicNetworkAccess is Disabled.
Why it's wrong here
When public network access is disabled, firewall rules are irrelevant.
✓
The Entra ID admin SID is invalid (all zeros).
Why this is correct
A zero GUID is not a valid SID for a user in Microsoft Entra ID.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The tenantId is missing in the Entra ID admin configuration.
Why it's wrong here
TenantId is present in the template.
✗
The Entra ID admin type should be 'Group' not 'User'.
Why it's wrong here
The type can be User or Group, both are valid.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume public network access disabled requires a firewall rule, but the actual cause is the invalid Entra ID admin SID, which is a subtle validation check that Azure performs regardless of network settings.
Detailed technical explanation
How to think about this question
Under the hood, Azure Resource Manager validates the Entra ID admin object ID against Azure Active Directory during deployment. A zeroed GUID is not a valid object ID and triggers a validation error before any resource provisioning begins. In real-world scenarios, this often happens when copying placeholder values from documentation or scripts without replacing them with actual object IDs from Entra ID.
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.
TExam Day Tips
→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-300 question in full detail.
Plan and implement data platform resources — This question tests Plan and implement data platform resources — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The Entra ID admin SID is invalid (all zeros). — The error occurs because the Entra ID admin SID is set to all zeros ('00000000-0000-0000-0000-000000000000'), which is an invalid GUID. Azure SQL Database requires a valid, non-zero SID (object ID) for the Entra ID admin to establish authentication. When public network access is disabled, the server can still be created without firewall rules, but the invalid SID prevents the deployment from succeeding.
What should I do if I get this DP-300 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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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