Before I was a DevOps engineer, I was a telecommunications engineer. That background keeps paying off in ways I didn’t expect when I moved into cloud and automation work.
Cloud platforms hide a lot of networking complexity behind friendly consoles and managed services, but that complexity doesn’t go away — it just moves. When a service can’t reach a database, when latency spikes between regions, or when a security group silently blocks traffic, the difference between guessing and diagnosing usually comes down to understanding what’s happening at the network layer.
A few concepts that come up constantly
- Subnetting and routing: knowing why a resource is public or private, and how route tables actually decide where traffic goes.
- DNS resolution: a huge share of “the app is down” incidents trace back to DNS, not the application itself.
- TLS handshakes and certificates: expired or misconfigured certificates are one of the most common causes of outages I’ve debugged.
- Load balancing behavior: understanding health checks, sticky sessions and timeouts saves hours when traffic patterns look strange.
The takeaway
You don’t need to relearn OSI layers from scratch, but investing time in networking fundamentals makes cloud and DevOps troubleshooting dramatically faster. It’s the difference between reading an error message and actually understanding the system that produced it.