Courseiva
← PL-300
Full test
Question 963 of 966
Prepare the data →mediumMultiple ChoiceObjective-mapped

Quick Answer

The answer is to change the credential type to 'Account Key' and provide the storage account key. This is correct because Azure Blob Storage containers configured as private require authenticated access; the Anonymous credential type only works when the container has been explicitly set to allow public access, which is not the case when the refresh fails. The Account Key option authenticates directly via the Azure Storage REST API, granting Power BI the necessary permissions to read the private blob data. On the PL-300 exam, this scenario tests your understanding of data source credential configuration, a common trap where candidates mistakenly leave Anonymous selected for private containers. Remember the memory tip: if the blob is private, you must provide a key; Anonymous is only for public containers.

PL-300 Prepare the data Practice Question

This PL-300 practice question tests your understanding of prepare the data. 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.

Exhibit

{
  "credentials": [
    {
      "datasource": "AzureBlob",
      "credentialType": "Anonymous"
    },
    {
      "datasource": "SqlServer",
      "credentialType": "Basic",
      "username": "bi_user",
      "password": "EncryptedPassword"
    }
  ]
}

Refer to the exhibit. You are reviewing a Power BI data source credential configuration. The Azure Blob Storage data source uses 'Anonymous' credentials. However, the refresh fails with an error indicating that the blob container is private and requires authentication. Which change should you make?

Question 1mediummultiple choice
Full question →

Exhibit

{
  "credentials": [
    {
      "datasource": "AzureBlob",
      "credentialType": "Anonymous"
    },
    {
      "datasource": "SqlServer",
      "credentialType": "Basic",
      "username": "bi_user",
      "password": "EncryptedPassword"
    }
  ]
}

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

Change credential type to 'Account Key' and provide the storage account key.

Azure Blob Storage containers that are private require authentication. The 'Account Key' credential type in Power BI uses the storage account key to authenticate via the Azure Storage REST API, which is the correct method for accessing private blob containers. Anonymous access only works when the container is configured for public access.

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.

  • ✗

    Change credential type to 'Service Principal' and provide the app ID and secret.

    Why it's wrong here

    Service principal can be used but requires proper RBAC; account key is simpler.

  • ✓

    Change credential type to 'Account Key' and provide the storage account key.

    Why this is correct

    Account key or SAS token is required for private blob containers.

    Related concept

    Read the scenario before looking for a memorised answer.

  • ✗

    Change credential type to 'Basic' and provide the storage account name and key.

    Why it's wrong here

    Basic authentication is for SQL Server, not Azure Blob.

  • ✗

    Change credential type to 'Windows' for the Azure Blob datasource.

    Why it's wrong here

    Windows credentials are for on-premises, not Azure Blob.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates may confuse 'Anonymous' with a valid credential type for private containers, or incorrectly assume that 'Basic' authentication is equivalent to providing a username and password for Azure Storage.

Detailed technical explanation

How to think about this question

The Azure Blob Storage REST API uses either Shared Key authorization (account key) or SAS tokens for authentication. The account key is a 512-bit base64-encoded string that grants full access to the storage account. Power BI stores this key securely in the gateway or cloud service and uses it to generate the Authorization header for each request. In contrast, anonymous access requires the container's ACL to be set to 'Blob' or 'Container' public access level.

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.

What to study next

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

Related practice questions

Related PL-300 practice-question pages

Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.

Prepare the data practice questions

Practise PL-300 questions linked to Prepare the data.

Deploy and maintain assets practice questions

Practise PL-300 questions linked to Deploy and maintain assets.

Model the data practice questions

Practise PL-300 questions linked to Model the data.

Visualize and analyze the data practice questions

Practise PL-300 questions linked to Visualize and analyze the data.

Manage and secure Power BI practice questions

Practise PL-300 questions linked to Manage and secure Power BI.

PL-300 fundamentals practice questions

Practise PL-300 questions linked to PL-300 fundamentals.

PL-300 scenario practice questions

Practise PL-300 questions linked to PL-300 scenario.

PL-300 troubleshooting practice questions

Practise PL-300 questions linked to PL-300 troubleshooting.

Practice this exam

Start a free PL-300 practice session

Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.

10 questions20 questions30 questions50 questionsTimed 30
PL-300 practice-test guide →Study guide →Browse all practice tests

FAQ

Questions learners often ask

What does this PL-300 question test?

Prepare the data — This question tests Prepare the data — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Change credential type to 'Account Key' and provide the storage account key. — Azure Blob Storage containers that are private require authentication. The 'Account Key' credential type in Power BI uses the storage account key to authenticate via the Azure Storage REST API, which is the correct method for accessing private blob containers. Anonymous access only works when the container is configured for public access.

What should I do if I get this PL-300 question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

About these practice questions

Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →

How Courseiva writes practice questions · Editorial policy

Keep practising

More PL-300 practice questions

Browse all PL-300 questions →

Last reviewed: Jun 24, 2026

Question Discussion

Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.

Loading comments…

Sign in to join the discussion.

This PL-300 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PL-300 exam.