12 AWS Networking Interview Questions and What Interviewers Really Want to Hear

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A seasoned interviewer who has conducted around 40 AWS-focused technical interviews shares the 12 most common networking questions and the reasoning behind each. Data from 1,393 interview sessions on LastRound AI between January 2025 and July 2026 shows DevOps Engineering roles attracted more candidates than backend, frontend, and full-stack combined, raising the competitive bar. Many candidates fail not because the questions are difficult, but because they recite definitions instead of demonstrating diagnostic thinking. Key topics include VPC CIDR planning, the difference between public and private subnets, stateful security groups versus stateless NACLs, and systematically troubleshooting why an EC2 instance cannot reach the internet. The article emphasizes that strong candidates walk through problems as a logical chain rather than naming a single cause and stopping.

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