DEA-C01 Data Operations and Support Practice Question
A data engineer needs to troubleshoot a failed AWS Glue job that reads from an Amazon RDS for MySQL database. The error log shows 'Communications link failure'. Which step should the engineer take FIRST?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Check that the security group associated with the Glue job allows outbound traffic to the RDS database.
A 'Communications link failure' often indicates network connectivity issues; verifying that the Glue job's security group allows outbound traffic to the RDS database is the first troubleshooting step. Option A is wrong because the error is not about authentication. Option C is wrong because the issue is not about table structure. Option D is wrong because the error is not about permissions.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Increase the job timeout and retry count.
Why it's wrong here
Does not address connectivity failure.
- ✓
Check that the security group associated with the Glue job allows outbound traffic to the RDS database.
Why this is correct
Network connectivity is the most common cause of this error.
- ✗
Verify that the database username and password are correct in the Glue connection.
Why it's wrong here
Authentication would produce a different error.
- ✗
Confirm that the table schema in MySQL matches the Glue Data Catalog.
Why it's wrong here
Schema mismatch would cause a different error.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This DEA-C01 practice question is part of Courseiva's free Amazon Web Services 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 DEA-C01 exam.