How packets travel — from cables to the OSI model.
The foundational vocabulary every networker needs: hosts, links, addresses, the OSI and TCP/IP models, the difference between TCP and UDP, and the way Ethernet, IP, and the application layer combine to deliver a single web request.
Welcome to module 1. How packets travel — from cables to the OSI model. I'll meet you again at the top of every chapter — this module's course coverage is 18%, so don't rush it. Pick chapter 1.1 below to start.
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