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Fundamentals

Computer Networks

From bits on a wire to HTTP/3: master the OSI & TCP/IP models, IP addressing, routing, TCP internals, DNS, TLS and real troubleshooting — with interactive simulators instead of dry diagrams.

Beginner
5 weeks
6 modules · 31 lessons
STACKSHADE / COURSE
Fundamentals

Computer Networks

LEARNER OUTCOMES

What you should be able to do

  • Explain any packet's full journey across the Internet
  • Subnet IPv4 networks and read routing tables confidently
  • Debug connectivity layer-by-layer like an SRE
  • Answer CN questions in interviews and college exams
TOPIC FORMAT

Every topic has two modes

Read — deep article with diagrams, artifacts and retrieval.

Present — focused deck with notes, pointer, timer and fullscreen.

Review — spaced review queue with due dates and recall ratings.

Focus — Pomodoro sessions, daily goals and a persistent scratchpad.

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Read → predict → inspect → retrieve. Your progress stays on this device.

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STUDY LOOP

Designed around learning, not scrolling

Each topic now has the full loop: article, visual explanation, artifact, retrieval and a recordable presentation.

Retrieval

Recall before revealing. The attempt is part of the learning action.

Spacing

Return at increasing intervals instead of rereading everything immediately.

Generation

Predict the next state or answer before seeing the worked version.

Dual coding

Pair compact prose with diagrams, traces, tables and motion.

Feynman

Teach the idea back in plain language to expose missing links.

Interleaving

Contrast nearby problem types so recognition becomes more useful.

CURRICULUM

Pick a topic

OSI Model Explained — interactive deep dive
Read15 min
ReadDeck
OSI Layer Explorer + Encapsulation Simulator
Interactive15 min
ReadDeck
What happens when you type google.com
Video12 min
ReadDeck
TCP handshake + OSI vs TCP/IP + practice quiz
Interactive15 min
ReadDeck
FEYNMAN PROMPT

Explain a webpage load using the letter-delivery analogy — all 7 layers, no notes.

ACTIVE RECALL
Walk the PDU chain from browser to wire.

Data (L7–5) → Segment (L4, +ports) → Packet (L3, +IPs) → Frame (L2, +MACs/FCS) → Bits (L1, signals).

Which layers do switches, routers and firewalls operate at?

Switch = L2 (MAC), Router = L3 (IP), Firewall = L4 (ports/state).

KEEP GOING

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