Computer Networks
Follow one web request all the way down the stack and back
6 lessons · 1.2 hours of reading
· Intermediate · 3 free
Layers, IP addressing, TCP, DNS and TLS explained by tracing what really happens when you open a website. Worked subnetting sums and commands you can run on your own laptop.
Lessons
1
What happens when you type a URL and press enter
The complete journey from keystroke to rendered page, in the order it really occurs.
2
The layered model, without reciting it like a poem
Why layering exists at all, and what each header actually adds to your bytes.
3
IP addressing and subnetting, with worked examples
Masks, prefixes and block size, then two full sums solved digit by digit.
4
TCP vs UDP, and why each one exists
What reliability costs, how TCP delivers it, and the cases where UDP is the correct choice.
5
DNS, DHCP and ARP: the three protocols that make it work
How you get a name resolved, an address assigned, and a MAC discovered.
6
HTTP, HTTPS, and what TLS actually protects
The request-response format, and the precise list of what encryption hides and what it does not.
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