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Networks

Networking

Subnetting, routing, and firewalls — how packets actually get where they are going.

Prerequisite: Computer Math

What you'll actually learn

Networking is usually taught as a stack of acronyms to memorize in order. This track instead follows one question all the way through: how does a packet you send actually find its way to a server on the other side of the world and back? Subnetting, routing tables, and firewall rules stop being separate topics once you see them as the three things a packet has to survive, in sequence, on every single hop of that trip.

What you'll be able to do

You'll take a network that's silently dropping traffic — a bad subnet mask, a missing route, an overly aggressive firewall rule — and isolate exactly which of the three is responsible before touching a single config file. That diagnostic instinct is what separates someone who can recite OSI layers from someone you'd actually trust with a production network.

Syllabus

1What Even Is a Network?core~12 min
2The Layered Model: OSI and TCP/IPcore~15 min
3Ethernet, MAC Addresses, and ARPcore~14 min
4IP Addressing and Subnetting in the Real Worldcore~16 min
5Routing and Gateways: Finding the Waycore~14 min
6TCP vs UDP: Two Ways to Talkcore~14 min
7Ports and Sockets: Where Connections Liveadvanced~13 min
8NAT and Firewalls: Guarding the Front Dooradvanced~15 min
9Troubleshooting Like a Pro: the Diagnostic Ladderadvanced~15 min

Frequently asked

How long does Networking take to complete?

Roughly 2 hours across 9 hands-on quests — you can go at your own pace and pick up exactly where you left off.

What do I need to know before starting Networking?

You should be comfortable with Computer Math first — the skill tree unlocks Networking once you've cleared those.

Is Networking free to learn?

Yes — Networking is fully available on the free tier, starting with a free first quest and no payment method required to sign up. Plus and Elite remove pacing limits but don't gate any of the Networking curriculum behind a paywall.

Start this skill for free

Create a free account and begin your first quest — no card required.

Start free