ANS-C01 Network Implementation Practice Question
Which TWO of the following are valid options for implementing network segmentation in a VPC?
⚠ Common exam trap
AWS often tests the misconception that Route Tables or NAT Gateways provide segmentation, but they are routing and translation services, not access control boundaries; the trap is confusing traffic direction with traffic filtering.
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 (A) are stateful virtual firewalls that operate at the instance level (ENI), allowing you to control inbound and outbound traffic based on rules. They are a valid mechanism for network segmentation because you can assign different Security Groups to different instances or groups of instances to isolate traffic between tiers (e.g., web, app, database). Subnets (B) provide network segmentation at the VPC subnet level by dividing the VPC's IP address range into smaller segments, each associated with a specific Availability Zone and route table, enabling logical separation of resources.
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
Security groups act as virtual firewalls for instances.
- ✓
Subnets
Why this is correct
Subnets allow you to partition the VPC IP address space.
- ✗
Route Tables
Why it's wrong here
Route tables control traffic flow but are not a segmentation boundary.
- ✗
NAT Gateway
Why it's wrong here
NAT Gateway provides outbound internet access, not segmentation.
- ✗
Internet Gateway
Why it's wrong here
Internet Gateway provides internet connectivity, not segmentation.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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