ANS-C01 Network Management and Operations Practice Question
A network engineer is analyzing VPC Flow Logs and notices that some rejected traffic is not logged. Which THREE conditions could cause this?
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 Flow Logs capture only accepted traffic due to the filter.
Correct options are C, D, and E. Option C: If the Flow Logs are configured to capture only accepted traffic (filter: ACCEPT), then rejected traffic is not logged. Option D: Flow Logs are per network interface; if the traffic does not traverse the monitored interface, it won't be logged. Option E: Security groups operate at the instance level; if a security group blocks traffic before it reaches the network interface, the flow log for that interface will not capture the rejected traffic. Options A and B are incorrect because network ACLs operate at the subnet level and their deny actions are logged by Flow Logs if the traffic reaches the subnet; destination network rejection is also logged as 'REJECT' in the flow log record.
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 traffic is blocked by a network ACL.
Why it's wrong here
Flow Logs capture traffic blocked by NACL.
- ✗
The traffic is rejected by the destination network.
Why it's wrong here
Flow Logs capture rejected traffic if it reaches the interface.
- ✓
The Flow Logs capture only accepted traffic due to the filter.
Why this is correct
Flow Logs can filter by acceptance status.
- ✓
The Flow Logs are configured for a specific network interface only.
Why this is correct
Flow Logs are per interface; traffic to other interfaces is not logged.
- ✓
The traffic is blocked by a security group before reaching the network interface.
Why this is correct
Flow Logs capture traffic after security group evaluation; if blocked, it may not be logged.
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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.