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The essentials
Every guide in this topic
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What is an IP address? IPv4 and IPv6 explained
The number every device on the internet uses to find every other device, the difference between IPv4 and IPv6, and public versus private addresses.
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How HTTPS works
What the padlock actually means, what a certificate proves, and what happens in the first fraction of a second of every secure connection.
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What is a port number?
If an IP address finds the server, the port finds the right program on it. The common ports, and how to see which ones…
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What is a CDN?
A content delivery network keeps copies of your site’s files in data centers around the world, so visitors download them from somewhere close.
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What is caching? Browser, page and object caches
Caching keeps a ready-made copy of something so it does not have to be built again. The layers that make websites fast, and when…
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RAID levels explained: 0, 1, 5, 6 and 10
How each RAID level spreads data across disks, how many failures it survives, how much space you keep, and why RAID is still not…
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What is a reverse proxy?
A server that stands in front of your other servers, takes every request and decides who answers. What it does, when you need one,…