Computer Networking
How machines find each other and move bytes between them, from addressing up to the request your browser makes
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1
DNS: turning names into addresses
What happens between typing a hostname and the first packet leaving your machine.
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2
What an IP address actually is
Addressing, subnets and why 192.168.x.x keeps showing up on your home network.
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3
TCP, UDP and what a port is for
Two ways to send data, and why one of them checks its work.