The OSI Model
How networks really talk, one layer at a time: the seven OSI layers, MACs and ARP, IP and routing, TCP, UDP and ports, encapsulation, and the full journey of a packet, with hands-on terminal walkthroughs.
Topics
Syllabus
8 chapters32 lessons32 challengesWhy Layers
4 lessons4The Physical Layer
3 lessons3Data Link and MACs
4 lessons4The Network Layer
4 lessons4Transport: TCP and UDP
5 lessons5The Upper Layers
4 lessons4Encapsulation
4 lessons4The Journey of a Packet
4 lessons4More like this
LAN Labs
Build, address and troubleshoot small networks in a terminal lab: hosts, switches and routers, cables, IPv4 addresses and masks, ARP, gateways, routing tables, and the classic faults that break real LANs.
Certificate on completion
- 35
- 35
IP Addressing and Subnetting
Master IP addresses from the bits up: binary, IPv4 anatomy, subnet masks, CIDR, subnetting drills, private ranges, network planning with VLSM, and a first look at IPv6. Practice everything in the terminal.
Certificate on completion
- 46
- 46
Binary Tree - Data Structures Series #3
In this course, you will learn about the Binary Tree data structure, create a Binary Tree from zero using your preferred language, and practice coding challenges with it!
- 13
- 5
- 1
Stack - Data Structures Series #1
In this course, you will learn about the Stack data structure, create a Stack from zero using your preferred language, and practice coding challenges with it!
- 13
- 6
- 1
Hash Tables - Data Structures Series #4
In this course, you will learn about the Hash Table data structure, create a Hash Table from zero using your preferred language, and practice coding challenges with it!
Certificate on completion
- 14
- 12
Frequently asked questions
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