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CompTIA Certification
DA0-001 Exam
CompTIA.DA0-001.v2026-02-06.q156 Dumps

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Question 106

Encryption is a mechanism for protecting data.
When should encryption be applied to data?
Choose the best answer.

A.When data is at rest.
B.When data is at rest or in transit.
C.When data is in transit.
D.When data is at rest, unless you are using local storage.

Correct Answer: B

Correct answer B. When data is at rest or in transit.
To provide maximum protection, encrypt data both in transit and at rest.

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Question 107

Taylor wants to investigate how manufacturing, marketing, and sales expenditures impact overall profitability for her company.
Which of the following systems is the most appropriate?

A.OLTP.
B.OLAP.
C.Data warehouse.
D.Data mart.

Correct Answer: C

A Data mart is too narrow, because Taylor needs data from across multiple divisions.
OLAP is a broad term for analytical processing, and OLTP systems are transactional and not ideal for the task. Since Taylor is working with data across multiple different divisions, she will work with a Data warehouse.

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Question 108

Which of the following best describes the use of a tab sequence?

A.\t
B.\\t
C.\l
D.\\l

Correct Answer: A

In common programming and text-processing contexts, including those referenced in data work:
* The tab character is represented by the escape sequence \t.
* This is used in many languages and tools (e.g., Python, R, many text editors) to indicate a horizontal tab, often used as a delimiter in tab-separated values (TSV) files.
Why the other options are incorrect:
* \\t (B): Represents a literal backslash followed by t (i.e., \t as text), not the tab character itself.
* \l (C) and \\l (D) - these are not standard escape sequences for tab characters in typical data/Script contexts.
Therefore, the escape representing a tab sequence is \t (A).
CompTIA Data+ Reference (concept alignment):
* DA0-001 Exam Objectives - Data formats and parsing (e.g., CSV, TSV), where tab-delimited data is represented using the \t escape.
* Study content showing examples of parsing or generating tab-delimited text using \t.

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Question 109

A database administrator is required to mask certain table columns containing PII in order to comply with the company privacy policy. Which of the following are the most likely types of information the administrator should mask? (Select two).

A.Government-issued ID
B.Address
C.Order ID
D.Order date
E.Customer ID
F.Referral number

Correct Answer: A,B

Personally Identifiable Information (PII) refers to any data that can be used to identify a specific individual.
To comply with privacy policies, it's crucial to mask such information to protect individual privacy.
Option A:Government-issued ID
* Rationale:Government-issued IDs (e.g., Social Security numbers, driver's license numbers) are direct identifiers and are considered sensitive PII. Masking this information prevents unauthorized access to critical personal data.
Option B:Address
* Rationale:An individual's address is also considered PII, as it can be used to locate and identify a person. Masking addresses helps in protecting personal location information.
Option C:Order ID
* Rationale:An order ID is typically a unique identifier for a transaction and does not directly identify an individual.
Option D:Order date
* Rationale:The date of an order does not constitute PII, as it doesn't provide information that can identify a person.

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Question 110

You are working with a dataset and need to swap the values in rows with those in columns.
What action do you need to perform?

A.Recording
B.Filtering.
C.Aggregation.
D.Transposition.

Correct Answer: D

Explanation
Transpose creates a new data file in which the rows and columns in the original data file are transposed so that cases (rows) become variables and variables (columns) become cases. Transpose automatically creates new variable names and displays a list of the new variable names.
Transposing data is useful for data analysis. At times, we have to pull data from various files with different formats for analysis and preparing reports. In such circumstances, we may have to transpose some data from one file to the other. In excel, we can transpose data in multiple ways.

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