The answer is a local file path that becomes inaccessible after deployment. This is the most likely cause of a Power Query Excel file path error after deployment because M queries hardcode absolute local paths like C:\Users\... which do not exist on the Power BI Service or any other machine. The PL-300 exam frequently tests your understanding of gateway dependencies and relative vs. absolute paths, often using this exact scenario as a trap—candidates mistakenly blame date filter syntax or data type transformations, but the real issue is that the Excel.Workbook function itself is fine. Remember the memory tip: if the path starts with a drive letter, it will fail after deployment; always use a shared network path or a data source in the service.
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
Refer to the exhibit.
// M query snippet
let
Source = Excel.Workbook(File.Contents("C:\Sales.xlsx"), null, true),
Sales_Table = Source{[Item="Sales",Kind="Table"]}[Data],
#"Changed Type" = Table.TransformColumnTypes(Sales_Table,{{"Date", type date}, {"Amount", type number}}),
#"Filtered Rows" = Table.SelectRows(#"Changed Type", each [Date] >= #date(2024,1,1))
in
#"Filtered Rows"
You are reviewing the M query snippet above. The query imports an Excel file and filters rows where Date is on or after January 1, 2024. However, the query fails with an error. 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.
Refer to the exhibit.
// M query snippet
let
Source = Excel.Workbook(File.Contents("C:\Sales.xlsx"), null, true),
Sales_Table = Source{[Item="Sales",Kind="Table"]}[Data],
#"Changed Type" = Table.TransformColumnTypes(Sales_Table,{{"Date", type date}, {"Amount", type number}}),
#"Filtered Rows" = Table.SelectRows(#"Changed Type", each [Date] >= #date(2024,1,1))
in
#"Filtered Rows"
A
The data type conversion cannot handle null values.
Why wrong: Null values are allowed in type conversions.
B
The Excel.Workbook function cannot read .xlsx files.
Why wrong: It can read .xlsx files.
C
The date filter syntax is incorrect.
Why wrong: #date is valid M syntax.
D
The file path is local and may not be accessible after deployment.
Hardcoded local paths cause failures when the file is not available.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The file path is local and may not be accessible after deployment.
Option B is correct because the file path is hardcoded to a local drive, which may not exist on the Power BI Service or another machine. Option A is wrong because the date filter syntax is correct. Option C is wrong because the Excel.Workbook function handles .xlsx files. Option D is wrong because the data type transformations are correct.
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.
✗
The data type conversion cannot handle null values.
Why it's wrong here
Null values are allowed in type conversions.
✗
The Excel.Workbook function cannot read .xlsx files.
Why it's wrong here
It can read .xlsx files.
✗
The date filter syntax is incorrect.
Why it's wrong here
#date is valid M syntax.
✓
The file path is local and may not be accessible after deployment.
Why this is correct
Hardcoded local paths cause failures when the file is not available.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
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.
What to study next
Got this wrong? Here's your next step.
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 PL-300 NAT questions on configuration and troubleshooting.
Prepare the data — This question tests Prepare the data — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The file path is local and may not be accessible after deployment. — Option B is correct because the file path is hardcoded to a local drive, which may not exist on the Power BI Service or another machine. Option A is wrong because the date filter syntax is correct. Option C is wrong because the Excel.Workbook function handles .xlsx files. Option D is wrong because the data type transformations are correct.
What should I do if I get this PL-300 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 PL-300 NAT questions on configuration and troubleshooting.
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?
Static NAT maps one inside address to one outside address.
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