ANS-C01 Network Design Practice Question
A company is designing a VPC with public and private subnets. The company needs to provide internet access to instances in the private subnets. Which TWO components are required? (Choose TWO.)
⚠ Common exam trap
A common mix-up: candidates think a NAT Gateway alone is sufficient, forgetting that an Internet Gateway must be attached to the VPC and the public subnet's route table must point to it for the NAT Gateway to reach the internet.
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
✓
Internet Gateway attached to the VPC
An Internet Gateway (IGW) is required to provide a target in the VPC route tables for internet-bound traffic. For instances in private subnets, a NAT Gateway placed in a public subnet translates their private IP addresses to the public IP of the NAT Gateway, allowing outbound internet access while preventing unsolicited inbound connections. The private subnet's route table must point 0.0.0.0/0 to the NAT Gateway, and the public subnet's route table must point 0.0.0.0/0 to the IGW.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Internet Gateway attached to the VPC
Why this is correct
IGW is needed for public subnet and NAT.
- ✗
Transit Gateway
Why it's wrong here
Not needed for this simple design.
- ✓
NAT Gateway in a public subnet
Why this is correct
NAT enables outbound internet for private instances.
- ✗
VPC Gateway Endpoint for S3
Why it's wrong here
Provides private access to S3, not general internet.
- ✗
Virtual Private Gateway
Why it's wrong here
Used for VPN, not internet.
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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.