ANS-C01 Network Security, Compliance and Governance Practice Question
A security team needs to log all rejected traffic to an internet-facing Network Load Balancer (NLB) for compliance. Which configuration should they use?
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
✓
Enable access logs on the NLB
NLB access logs capture information about rejected traffic when enabled. Option A is wrong because VPC Flow Logs do not capture traffic that is rejected by the NLB itself before reaching the target. Option B is wrong because CloudTrail logs API calls, not network traffic. Option C is wrong because ALB is a different load balancer type and does not apply to NLB.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Enable VPC Flow Logs on the NLB subnets
Why it's wrong here
VPC Flow Logs capture accepted and rejected traffic at the ENI level, but NLB rejects traffic before it reaches the ENI.
- ✗
Enable AWS CloudTrail for the NLB
Why it's wrong here
CloudTrail logs API calls, not network traffic.
- ✗
Enable access logs on an Application Load Balancer in front of the NLB
Why it's wrong here
ALB access logs are for ALB, not NLB.
- ✓
Enable access logs on the NLB
Why this is correct
NLB access logs capture information about rejected traffic.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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