Networking Fundamentals Every DevOps Engineer Should Know (IP, DNS & Ports)

The article covers the networking basics DevOps engineers need to troubleshoot connectivity across servers, containers, clusters, and cloud systems.

It explains core concepts such as IP addresses, public and private ranges, localhost, subnets and CIDR, plus DNS lookup flow and common DNS records.

It also reviews ports, the client-server model, and practical troubleshooting commands used to diagnose failures.

These fundamentals are essential for resolving outages, failed deployments, unreachable apps, and communication issues in modern infrastructure.