Naming and Discovery
Learn how domain names translate to addresses and how computers find each other on the vast internet.
6 lessons
What Is DNS?
DNS is the internet's phonebook — it translates human-friendly domain names into the IP addresses computers actually use.
How DNS Lookups Work
DNS lookups involve multiple servers working together — like asking successive people for directions until you find your destination.
Domains and Subdomains
Domain names follow a hierarchical structure — like addresses that go from country to city to street to building.
DNS Records Overview
Different DNS record types serve different purposes — like different entries in a directory for phone numbers, addresses, and aliases.
Why DNS Problems Break the Internet
When DNS fails, websites become unreachable — even if the servers are running perfectly fine.
How Browsers Use DNS
Before your browser can load a webpage, it must first translate the domain name into an IP address using DNS.
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