396. 10 AWS VPC & Networking Interview Questions with Answers (Q&A)

Prepare for AWS interviews with these 10 VPC & Networking Q&A scenarios. Covers NAT Gateway, VPC Peering, Transit Gateway, Firewall compliance, and real-world solutions.

Venkatramanan C S

3 min read

·

Sep 30, 2025

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Introduction

When preparing for AWS interviews or architecting secure cloud solutions, VPC and networking scenarios come up often. Here are 10 frequently asked questions with detailed answers that will boost your knowledge and help you ace interviews.

Lets Get Started

1.You have a private subnet with no internet access, but instances need updates. How do you enable this securely?

👉 Use a NAT Gateway (or NAT Instance, but NAT Gateway is managed and recommended).

Place the NAT Gateway in a public subnet.

Update the private subnet route table to send internet-bound traffic (0.0.0.0/0) to the NAT Gateway.

This way, instances can download patches/updates without being exposed to inbound internet traffic.

2. An application in one VPC needs to communicate with a database in another (same region). How would you set this up?