The second address family, already running on your machine
Read an IPv6 address, recognise the three scopes, and understand why localhost can lead somewhere nothing is listening.
22 minutesTechnical content last reviewed on 20 Sept 2026
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What this lesson builds
- Deciding whether a destination is a neighbour
- Reading system state without over-reading it
End of the course
Ports, TCP and UDP: how two programs talk
An address names a machine, a port names a program — and a connection is nothing more than two kernels agreeing.
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