Showing posts with label DNS. Show all posts
Showing posts with label DNS. Show all posts

Friday, February 14, 2020

DNS & IP Explained

One of the things that quickly became clear when I started teaching an introduction to computer science course for high school freshmen was that while they are happy to use the Internet, they don't really understand how the Internet works. I suppose the same can be said for lots of adults too. The Domain Name Systems is the most important or at least most frequently used part of how people use the Internet today. PowerCert Videos, a YouTube channel that I featured a couple of weeks ago, has a good video that explains how a DNS server works. I used this video with my own students earlier this year. offers a video on the same topic.'s video gets into a bit more of the history of the development of the Internet. I also showed this video to my students, but I didn't find it nearly as effective as the PowerCert video.

Applications for Education
If you have never built a website from scratch without the use of service like Weebly or Google Sites, you may not have ever thought about the role of IP addresses and the domain name system in getting a website online. These videos can help students understand how that process happens and how DNS makes it easy to navigate the web today.

Monday, September 10, 2012

What Happened to Free Technology for Teachers?

This picture has nothing to do with
this post. I just wanted to use it.
If you tried to visit Free Technology for Teachers today and found that it wouldn't load, you were not alone. GoDaddy, the service through which and many of its variant names are registered, had its DNS servers hacked today. What this meant was that any domain hosted and or registered through GoDaddy was inaccessible at times while GoDaddy was trying to fix this major problem. You can read more about this on TechCrunch or your favorite tech industry blog.

The good news is that GoDaddy is now reporting that most sites are back to normal. And if you're reading this, this one is too.