# DNS and FB down - Class discussion today for APCSP

**URL:** https://forum.makecode.com/t/dns-and-fb-down-class-discussion-today-for-apcsp/10317
**Category:** AP CS Principles
**Created:** [October 5, 2021, 3:27pm UTC](https://forum.makecode.com/t/dns-and-fb-down-class-discussion-today-for-apcsp/10317 "2021-10-05T15:27:40Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![grandmadeb](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.makecode.com/grandmadeb/32/4449_2.png) [@grandmadeb](https://forum.makecode.com/u/grandmadeb)
#### Post date: [October 5, 2021, 3:27pm UTC](https://forum.makecode.com/t/dns-and-fb-down-class-discussion-today-for-apcsp/10317/1 "2021-10-05T15:27:40Z")

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Timely discussion of DNS servers after Facebook went down yesterday…for our Computer Science Principles class. Here is my doc; hope it helps:  
[Domain Name Servers and the FB Crash](https://docs.google.com/document/d/1Waxh2tRmkfeDgPgqR2oc7sGnNAO7RMUgbgiDDtOg3tM/edit?usp=sharing)

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### Author: ![AlexK](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.makecode.com/alexk/32/33339_2.png) [@AlexK](https://forum.makecode.com/u/AlexK)
#### Post date: [October 15, 2021, 9:05pm UTC](https://forum.makecode.com/t/dns-and-fb-down-class-discussion-today-for-apcsp/10317/2 "2021-10-15T21:05:47Z")

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Ben Eater recently posted a great video on DNS, Internet routing, and why the Facebook service was unreachable for a few hours:

[![](https://img.youtube.com/vi/-wMU8vmfaYo/maxresdefault.jpg "Why was Facebook down for five hours?") ](https://www.youtube.com/watch?v=-wMU8vmfaYo)

Ben’s brilliant. I love his videos, and he has several wonderful series on computer architecture. If you want a hands-on way of learning how computers actually work, check out his YouTube channel, his website ( [https://eater.net](https://eater.net) ) … and, maybe, buy a kit from him!