🌐 Track 1: Universal Computer Networking Course (Vendor-Neutral)

How Computer Networks & The Internet Actually Work

Before diving into any cloud provider, master the universal building blocks that power every home, office, data center, and ISP on Earth: Switches (Layer 2), Routers (Layer 3), IPs & CIDR Subnetting, NAT, Firewalls, and BGP (Border Gateway Protocol).

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The Postal System Analogy: Every network packet has two addresses: a Layer-3 IP Address (the final Street Address & City) and a Layer-2 MAC Address (the next courier's handoff badge). A Switch passes notes between desks in the same room. A Router is the post office door that connects different rooms. NAT is the front desk that stamps your building's public return address. And BGP is the international air-traffic routing treaty connecting giant telecom networks across the globe!

🚀 Start Module G1: Switches & Routers → ☁️ Switch to Track 2: AWS Cloud Course

Layer 2 (Switch / MAC / VLAN) Layer 3 (Router / IP / CIDR) Layer 4 (NAT / Ports / Firewall) BGP (Inter-Domain Internet Routing)

Click any box on the diagram to inspect how it works!

🌐 Track 1 Curriculum: General Networking Interactive Modules

Pure networking fundamentals—explained visually with live frame/packet inspectors, binary subnet visualizers, NAT port tables, and BGP failure simulations.

Module G1 • Layer 2 vs. Layer 3

🔌 Switches, Routers, MAC Addresses, ARP & VLANs

See why Switches use MAC addresses inside a room while Routers connect different IP subnets—and watch the Ethernet MAC header rewrite at every router hop!

Open Switches & Routers Lab →

Module G2 • IP Addressing

🏘️ IP Addresses, CIDR Notation (`/24`) & Subnetting

Slide between /16, /24, /26, and /28 to see Network vs. Host bits in real time and test when two computers need a router to talk.

Open Interactive CIDR Slicer →

Module G3 • Network Edge & Security

🛡️ NAT / PAT, Port Forwarding & Stateful Firewalls

Watch multiple private devices share one Public IP via Port Address Translation (PAT), compare Stateless vs. Stateful Firewalls, and test DNAT port forwarding.

Open NAT & Firewalls Lab →

Module G4 • Global Internet Routing

✈️ BGP (Border Gateway Protocol) & Autonomous Systems

Cut a fiber link between ISPs and watch BGP recalculate the AS_PATH live, tune LOCAL_PREF, and block a BGP Route Hijack with RPKI!

Open BGP Internet Simulator →

Track 2 • Cloud Application

☁️ Ready for AWS Cloud Networking?

See how AWS turns these exact concepts into virtual building blocks: VPCs, Subnets, ENIs, NAT Gateways, VPC Endpoints, Security Groups, Transit Gateways, and Org SCPs.

Switch to Track 2: AWS Networking →