ANS-C01 Network Security, Compliance and Governance Practice Question
A company is designing a network security architecture for a VPC that hosts a multi-tier application. The security team wants to implement defense in depth. Which three layers of security should be configured?
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
✓
Security groups
Security groups act as virtual firewalls at the instance level, providing stateful filtering. Network ACLs provide stateless filtering at the subnet level, adding a perimeter layer. AWS WAF protects web applications at the application layer, guarding against common web exploits. Together, these three layers (A, B, E) implement defense in depth for network security. IAM policies (C) are for identity and access management, not network filtering. VPC Flow Logs (D) are for monitoring traffic, not blocking it.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Security groups
Why this is correct
Instance-level firewall.
- ✓
AWS WAF
Why this is correct
Application-layer protection.
- ✗
AWS Identity and Access Management (IAM) policies
Why it's wrong here
IAM controls access to AWS APIs, not network traffic.
- ✗
VPC Flow Logs
Why it's wrong here
Flow logs are for monitoring, not blocking.
- ✓
Network ACLs
Why this is correct
Subnet-level stateless firewall.
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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.