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
Welcome to Byte City
IT lessons you can actually picture.
Networking lessons to help absorb data networking in "byte" sizes, taught in Byte City by Professor Flows.
The format
How a lesson works
01 / 03
The Issue
A real outage. A question worth answering.
02 / 03
Byte City
Step inside the city and see how it works.
03 / 03
The real thing
A real terminal or screen you can use on Monday.
Watch and learn
Latest lessons
Your next stop in the city starts here.
9:34
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
9:36Ports 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
8:02Ports 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
Find your way around
The map
Seven floors. One click. Follow a request through the house and out across Byte City.
Explore the map7ApplicationL7
6PresentationL6
5SessionL5
4TransportL4
3NetworkL3
2Data LinkL2
1PhysicalL1
Take the tour