The Internet: IP Addresses & DNS

"It's always DNS" is an engineering in-joke, and this short video explains why. Vint Cerf and software engineer Paola Mejia cover how every device on a network gets a numeric address and how the Domain Name System turns a friendly web address into that number. At under seven minutes it pairs naturally with the packets video from the same Code.org series. It is the one to watch before your next outage review, when someone says a site was up but nobody could find it.