Networking

Beginner → Advanced

Packets to load balancers — and how to debug the path.

Outcome

Trace any request from the address bar to the database and find where it breaks.

The ladder

Beginner

▸What happens when you open a site
▸IP addresses
▸Ports
▸TCP vs UDP
▸Subnets / CIDR

Intermediate

▸DNS resolution
▸NAT
▸Routing vs firewalls
▸HTTP
▸Load balancing

Advanced

▸TLS handshake
▸Packet path
▸Latency vs bandwidth
▸Network troubleshooting
▸Design at scale

Example lessons

lesson

A web request, end to end

lesson

HTTP status codes and whose fault they are

lesson

Reading a packet's journey

Practise with puzzles

IntermediateDNS Works Here, Not There

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