The answer is to create separate datasets with and without sensitive columns and assign permissions accordingly, as object-level security (OLS) in Power BI can hide entire tables or columns from specific roles, but it is not a built-in feature for column-level masking in standard datasets. This is correct because OLS allows you to restrict visibility of sensitive columns like customer names by defining roles that exclude those columns, while row-level security (RLS) only filters rows and cannot hide columns themselves. On the Microsoft Power BI Data Analyst PL-300 exam, this concept tests your understanding of the distinction between OLS and RLS, with a common trap being to confuse RLS as a solution for column hiding—remember, RLS controls rows, not columns. A useful memory tip is "OLS hides columns, RLS hides rows," so when you need to hide sensitive columns, think "separate datasets for separate eyes."
PL-300 Manage and secure Power BI Practice Question
This PL-300 practice question tests your understanding of manage and secure power bi. 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.
Which TWO actions should you take to ensure that sensitive columns (e.g., customer names) are not visible to certain users in a Power BI report? (Select exactly two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use object-level security (OLS) to hide the columns for specific roles.
Object-level security (OLS) can hide entire columns from roles. Row-level security (RLS) filters rows but cannot hide columns. Building separate datasets is one way but not efficient. Option A and B are correct. Option C is wrong because RLS does not hide columns. Option D is wrong because that controls access to the report, not column visibility. Option E is wrong because masking is not available in Power BI.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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 object-level security (OLS) to hide the columns for specific roles.
Set the report to not allow users with certain roles to view the report.
Why it's wrong here
That hides the whole report, not just columns.
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
CIDR notation defines the prefix length.
Block size helps identify subnet boundaries.
Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
The required host count determines the smallest suitable subnet.
TExam Day Tips
→Write the block size before choosing the subnet.
→Check whether the question asks for hosts, subnets or a specific address range.
→Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related PL-300 subnetting questions on CIDR, address ranges, and subnet selection.
Manage and secure Power BI — This question tests Manage and secure Power BI — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Use object-level security (OLS) to hide the columns for specific roles. — Object-level security (OLS) can hide entire columns from roles. Row-level security (RLS) filters rows but cannot hide columns. Building separate datasets is one way but not efficient. Option A and B are correct. Option C is wrong because RLS does not hide columns. Option D is wrong because that controls access to the report, not column visibility. Option E is wrong because masking is not available in Power BI.
What should I do if I get this PL-300 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related PL-300 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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Question Discussion
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