9:50OSI Model
OSI Model Unwrapped!
A city, seven floors, and why the model lost as a design and won as a language.
9:50Coming soon
The catalogue
Lessons from Byte City
Networking concepts, made visible. Pick a street and start exploring.
All lessons
14 lessons9:50
4:59OSI Model
OSI Layer 1 Unwrapped! The Physical Layer
The road: copper, glass and radio, and what a dark link light means.
4:59Coming soon
6:28OSI Model
OSI Layer 2 Unwrapped! The Data Link Layer
The crate and the switch-depot: plaques, ribbons and who sorts by MAC.
6:28Coming soon
7:17OSI Model
OSI Layer 3 Unwrapped! The Network Layer
The mail bag, the road atlas and the gate at the end of the street.
7:17Coming soon
9:32OSI Model
OSI Layer 4 Unwrapped! The Transport Layer
Numbered doors, the truck that calls ahead and the bullhorn that doesn't.
9:32Coming soon
8:17OSI Model
OSI Layer 5 Unwrapped! The Session Layer
The delivery window, and the phone call that hangs up at thirty-two seconds.
8:17Coming soon
8:11OSI Model
OSI Layer 6 Unwrapped! The Presentation Layer
The packing room: the label printer, the vacuum sealer and the lock on door 443.
8:11Coming soon
8:07OSI Model
OSI Layer 7 Unwrapped! The Application Layer
The storefront, the mail room and the Yellow Pages, where every conversation begins.
8:07Coming soon
8:28OSI Model
OSI Model Unwrapped! One Click, All Seven Layers
One click, seven floors down, across the city, and back. Every layer in one trip.
8:28Coming soon
8:00OSI Model
OSI Model Unwrapped! Troubleshoot by Layer
Five tickets, four words: "the internet is down." Five questions, bottom up, find the floor.
8:00Coming soon
8:02Ports and Protocols
Common Ports Unwrapped! Web, Mail and Names
A new firewall on Friday. Monday: web fine, incoming mail fine, nobody can send. Know your doors and it takes one look.
8:02Coming soon
9:36Ports and Protocols
Common Ports Unwrapped! Remote Access, Files and the City Services
Four audit findings, four door numbers marked open, no lock. Every port left on the list, and the one rule that makes them stick.
9:36Coming soon
8:26Addresses and Subnetting
What an IP Address Really Is
A laptop that can print and reach nothing else. The address is fine. The number underneath it is not.
8:26Coming soon
9:34Addresses and Subnetting
Binary Without the Fear
An exam question, a thirty-second clock, and the lamps nobody ever showed you. Any subnet mask, in your head, in ten seconds.
9:34Coming soon