Explain what happens, step by step, between pressing Enter on a URL and seeing
a page — with no hand-waving.
Read an IP address and subnet mask and say exactly which addresses are on that
network. (Subnetting stops being scary.)
Use ping, traceroute, dig, curl, ss, and tcpdump deliberately
rather than hopefully.
Look at a packet capture and describe what the two machines are saying to each
other.
Diagnose the five most common network problems by their fingerprints, instead
of guessing.
Explain TCP's handshake, reliability, flow control, and congestion control —
and why a connection is slow.
Build a small production-like lab with DNS, TLS, load balancing, firewall
rules, containers/Kubernetes-style networking, monitoring, and packet
captures.
Write your own network tools in Go: a DNS client, a pcap decoder, a
TLS inspector, a load balancer with draining, a blackbox prober, and more
(§0.8 lists all 23 labs).
