DEA-C01 Data Ingestion and Transformation Practice Question
A data engineer runs an AWS Glue job that reads from a JDBC connection to a PostgreSQL database. The job fails with a 'Connection timed out' error. The Glue job runs in a VPC with the appropriate security group. What is the most likely cause?
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
✓
The network ACL associated with the Glue job's subnet is blocking outbound traffic.
The 'Connection timed out' error indicates a network connectivity issue. Since the Glue job runs in a VPC with a security group that likely allows outbound traffic, the most likely cause is that the network ACL (which is stateless) associated with the Glue job's subnet is blocking outbound traffic to the database. Option A is correct. Option B is incorrect because the error is not an authentication or permission issue. Option C is incorrect because the security group's inbound rule does not affect outbound traffic from the Glue job. Option D is incorrect because the error is network-related, not a credentials issue.
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 network ACL associated with the Glue job's subnet is blocking outbound traffic.
Why this is correct
Network ACLs can block traffic.
- ✗
The Glue job does not have permission to access the database.
Why it's wrong here
Permission issue would give access denied, not timeout.
- ✗
The security group does not allow inbound traffic from the Glue job.
Why it's wrong here
Inbound rule on database side needed, but Glue's security group needs outbound.
- ✗
The database credentials are incorrect.
Why it's wrong here
Would get authentication error, not timeout.
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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.