ANS-C01 Network Design Practice Question
Network Topology
A network engineer configured VPC Flow Logs for a subnet to capture all traffic. After reviewing the logs in CloudWatch Logs, they notice that some logs show 'NODATA' for the log-status field. What does 'NODATA' indicate?
⚠ Common exam trap
AWS often tests the distinction between 'NODATA' (no traffic) and 'SKIPDATA' (internal error), leading candidates to incorrectly associate 'NODATA' with rejected traffic or delivery failures.
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
✓
No network traffic was observed for the given capture period.
When VPC Flow Logs display 'NODATA' for the log-status field, it indicates that no network traffic was observed for the subnet during the aggregation interval (typically 10 minutes). This is a normal status meaning the capture window had zero packets flowing through the monitored interfaces, not an error or delivery 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.
- ✓
No network traffic was observed for the given capture period.
Why this is correct
Correct meaning.
- ✗
The flow log record was skipped due to an internal error.
Why it's wrong here
That's SKIPDATA.
- ✗
The log record was successfully delivered to CloudWatch.
Why it's wrong here
That's OK.
- ✗
The traffic was rejected by a network ACL or security group.
Why it's wrong here
That shows in the action field.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This ANS-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 ANS-C01 exam.