Quick Answer
The answer is USERPRINCIPALNAME and FILTER, as these two DAX functions are the correct choices to implement row-level security in Power BI. USERPRINCIPALNAME returns the email address of the current user viewing the report, which is then compared against a security table to restrict data access, while FILTER is used within the RLS expression to iterate over rows and apply the filtering condition. On the PL-300 exam, this topic tests your understanding of how dynamic RLS works by leveraging the current user’s identity rather than static roles; a common trap is confusing LOOKUPVALUE or CALCULATE as RLS tools, but LOOKUPVALUE only retrieves a single scalar value and CALCULATE modifies filter context rather than enforcing row-level restrictions. To remember this, think of USERPRINCIPALNAME as the “who” that identifies the user, and FILTER as the “how” that restricts the rows they see.
This PL-300 practice question tests your understanding of model the data. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 DAX functions can be used to implement row-level security (RLS) in Power BI?
FILTER
FILTER is commonly used in RLS to restrict rows based on a condition.
LOOKUPVALUE
Why wrong: LOOKUPVALUE is used to look up a single value, not for filtering rows in RLS.
USERNAME
USERNAME returns the domain\username, used in RLS rules.
CALCULATE
Why wrong: CALCULATE modifies filter context but is not typically used in RLS expressions.
USERPRINCIPALNAME
USERPRINCIPALNAME returns the user's email, used in RLS rules.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
FILTER
LOOKUPVALUE is not used for RLS; it retrieves a single value. FILTER is used within RLS expressions to filter rows. USERNAME and USERPRINCIPALNAME are used to get the current user. CALCULATE is not directly used in RLS filtering.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
FILTER
Why this is correct
FILTER is commonly used in RLS to restrict rows based on a condition.
Related concept
Read the scenario before looking for a memorised answer.
LOOKUPVALUE
Why it's wrong here
LOOKUPVALUE is used to look up a single value, not for filtering rows in RLS.
USERNAME
Why this is correct
USERNAME returns the domain\username, used in RLS rules.
Related concept
Read the scenario before looking for a memorised answer.
CALCULATE
Why it's wrong here
CALCULATE modifies filter context but is not typically used in RLS expressions.
USERPRINCIPALNAME
Why this is correct
USERPRINCIPALNAME returns the user's email, used in RLS rules.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
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
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.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Identify which PL-300 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.
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FAQ
Model the data — This question tests Model the data — Read the scenario before looking for a memorised answer..
The correct answer is: FILTER — LOOKUPVALUE is not used for RLS; it retrieves a single value. FILTER is used within RLS expressions to filter rows. USERNAME and USERPRINCIPALNAME are used to get the current user. CALCULATE is not directly used in RLS filtering.
Identify which PL-300 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.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 21, 2026
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.
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