ANS-C01 Network Security, Compliance and Governance Practice Question
A company is designing a network security architecture for a multi-tier application. Which TWO of the following are best practices for implementing defense in depth?
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
✓
Use security groups to control traffic between instances
The correct answers are B and D. Security groups act as stateful, instance-level firewalls, making them a best practice for controlling traffic between instances (B). Placing web servers in public subnets and application servers in private subnets provides network segmentation, a key defense-in-depth principle (D). Option A is incorrect because network ACLs are stateless, not stateful. Option C is incorrect because internet gateways should only be attached to public subnets, not all subnets. Option E is incorrect because using the same security group for all tiers reduces security boundaries.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use network ACLs as stateful firewalls at the subnet level
Why it's wrong here
Network ACLs are stateless.
- ✓
Use security groups to control traffic between instances
Why this is correct
Security groups act as instance-level firewalls.
- ✗
Attach internet gateways to all subnets for high availability
Why it's wrong here
Only public subnets need internet gateways.
- ✓
Place web servers in public subnets and application servers in private subnets
Why this is correct
This provides network segmentation.
- ✗
Use the same security group for all tiers to simplify management
Why it's wrong here
Different tiers should have different security groups.
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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.