The answer is network connectivity issues. When an ETL pipeline fails with a timeout error, it almost always points to a breakdown in communication between the pipeline and its source or target system; the process hangs while waiting for a response, eventually exceeding the timeout threshold and failing the job. On the CompTIA Data+ DA0-001 exam, this scenario tests your ability to distinguish network problems from other common failures like data format mismatches or authentication errors—timeouts are the classic trap for confusing a connectivity issue with a data quality issue. A quick memory tip: think of a timeout as a “no response” signal, not a “bad data” signal.
DA0-001 Communicating Data Insights Practice Question
This DA0-001 practice question tests your understanding of communicating data insights. 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
2023-03-15 14:32:10 ERROR: Failed to load data from source: Timeout expired.
2023-03-15 14:32:10 WARN: Retry attempt 1/3...
2023-03-15 14:32:15 ERROR: Retry 1 failed: Connection reset.
2023-03-15 14:32:15 WARN: Retry attempt 2/3...
2023-03-15 14:32:20 ERROR: Retry 2 failed: Server not responding.
2023-03-15 14:32:20 WARN: Retry attempt 3/3...
2023-03-15 14:32:25 ERROR: All retries exhausted. Pipeline failed.
Refer to the exhibit. An ETL pipeline failed. What is the most likely root 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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Network connectivity issues
The exhibit shows an ETL pipeline failure with a timeout error, which is a classic symptom of network connectivity issues. When the pipeline cannot reach the source or target system due to a network interruption, the process hangs until a timeout threshold is exceeded, causing the job to fail. This is the most likely root cause because timeouts are directly associated with network problems, not with data format, authentication, or storage issues.
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.
✗
Data format mismatch
Why it's wrong here
Data format errors would be schema-related, e.g., 'cannot parse'.
✗
Authentication failure
Why it's wrong here
Auth failures would show 'access denied' or 'invalid credentials'.
✗
Insufficient disk space
Why it's wrong here
Disk space issues would show 'disk full' errors, not network timeouts.
✓
Network connectivity issues
Why this is correct
Timeouts and connection resets are classic signs of network problems.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse a timeout error with a data format mismatch or authentication failure, but Cisco tests the understanding that timeouts are uniquely tied to network connectivity issues, not to data content or access permissions.
Trap categories for this question
Command / output trap
Auth failures would show 'access denied' or 'invalid credentials'.
Detailed technical explanation
How to think about this question
ETL pipelines often rely on TCP connections to transfer data; when a network issue occurs, the TCP stack retransmits packets and waits for acknowledgments, eventually triggering a timeout after the configured retransmission timeout (RTO) or application-level timeout (e.g., 30 seconds). In cloud-based ETL tools like AWS Glue or Azure Data Factory, network connectivity failures are commonly logged as 'Connection timed out' or 'Read timed out' errors, which can be diagnosed using tools like ping, traceroute, or netstat to verify reachability and latency.
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 practitioner preparing for the DA0-001 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
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.
Communicating Data Insights — This question tests Communicating Data Insights — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Network connectivity issues — The exhibit shows an ETL pipeline failure with a timeout error, which is a classic symptom of network connectivity issues. When the pipeline cannot reach the source or target system due to a network interruption, the process hangs until a timeout threshold is exceeded, causing the job to fail. This is the most likely root cause because timeouts are directly associated with network problems, not with data format, authentication, or storage issues.
What should I do if I get this DA0-001 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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?
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 →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A retail company has a data warehouse that integrates sales data from multiple sources including online transactions, in-store POS, and third-party marketplaces. The data team recently updated the ETL pipeline to add a new data source: mobile app purchases. After the update, the daily sales report shows a 15% increase in total sales compared to the previous day, which is unexpected because the mobile app is new and only contributed 2% of sales in tests. The report is created by a SQL script that aggregates sales by date and runs every morning. The data team needs to identify the cause of the discrepancy. Which of the following should the team do first?
easy
✓ A.Verify that the date filter in the SQL script is correct and not including future dates.
B.Compare the raw transaction counts from each source for that day.
C.Assume the increase is due to the mobile app and update the forecast.
D.Check if the ETL pipeline is double-counting transactions from the mobile app source.
Why A: Option D is correct because an unexpected large increase is often caused by a date filter error, such as including future dates or incorrect date ranges. A and B are valid next steps but less fundamental; C is premature and assumes the increase is real.
Last reviewed: Jun 24, 2026
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This DA0-001 practice question is part of Courseiva's free CompTIA 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 DA0-001 exam.
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