ANS-C01 Network Security, Compliance and Governance Practice Question
A company has a VPC with public and private subnets. The security team wants to allow instances in a private subnet to download software updates from the internet but prevent inbound internet traffic. Which AWS service should be used?
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
✓
NAT gateway
A NAT gateway allows outbound internet traffic from private subnets while blocking unsolicited inbound traffic. Option D is correct. Option A is wrong because an internet gateway enables bidirectional traffic, which would allow inbound traffic. Option B is wrong because AWS Site-to-Site VPN is used for hybrid connectivity between on-premises and AWS, not for outbound internet access from private subnets. Option C is wrong because VPC peering connects VPCs together, not to the internet.
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
Why it's wrong here
Internet gateway allows inbound and outbound traffic, not outbound-only.
- ✗
AWS Site-to-Site VPN
Why it's wrong here
VPN provides secure connection to on-premises, not internet access.
- ✗
VPC peering connection
Why it's wrong here
VPC peering does not provide internet access.
- ✓
NAT gateway
Why this is correct
NAT gateway enables outbound internet traffic from private subnets.
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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.