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Exploring Networking🔗

Debug faster. Route correctly. Keep services connected.

Exploring Networking

Welcome to a practical guide to the networking that production actually runs on — the DNS lookups, load balancers, certificates, and routes that keep services reachable, and the diagnostics that get them back when they break.

The Problem🔗

It's 2am. The API is timing out. Users are getting 502s from the load balancer. You SSH in and... where do you even start? Is it DNS? A firewall rule? Latency? An expired TLS certificate?

Traditional networking courses start with the OSI model and packet-tracer simulations. This site starts with "How do I fix this production outage right now?"

How It's Organized🔗

Content is structured by urgency and depth — the same three tiers as the rest of the Exploring sites.

  • Essentials

    The networking you reach for during an incident, and the mental model underneath it — how an endpoint gets exposed, TLS, DNS, load balancers, and SSH tunneling.

  • Efficiency

    Design and operate the layer that exposes and secures your services — CORS, reverse proxies and API gateways, and automated TLS certificates with ACME.

  • Mastery

    Advanced architecture, performance, and scale.

    Service mesh, packet capture and deep troubleshooting, network performance tuning, and multi-region networking (coming soon)

Deep Dives🔗

  • Deep Dives

    An ordered article series that stays inside this site, start to finish — TLS: the handshake, mTLS for APIs, and automated certificate management.

Who This Is For🔗

If you're the person who gets paged when an endpoint goes dark — or the one now asked to expose and secure a new one — this is for you. It assumes you're comfortable in a terminal and want to understand why the network behaves the way it does, not just which command to copy. No traditional networking background required; it meets you where you are.

Part of the BradPenney.io Network🔗

This site is part of a family of progressive technical learning resources:

  • linux.bradpenney.io — Linux teaches the network commands; this site teaches when and why to use them.
  • k8s.bradpenney.io — Kubernetes teaches Services and Ingress; this site teaches how they actually route traffic.
  • tools.bradpenney.io — the Dev Tools site teaches curl and dig; this site teaches what to send and how to read the response.
  • cs.bradpenney.io — Computer Science covers the theory behind TCP/IP, DNS, and routing.

Getting Started🔗

New here? Start with Essentials — once you can see how an endpoint is actually exposed, everything else about securing and debugging it falls into place.

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New articles publish straight to the RSS feed — no algorithm, no email required.

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