Showing posts with label PowerCert. Show all posts
Showing posts with label PowerCert. Show all posts

Monday, August 2, 2021

What is a Default Gateway? - A Concise Explanation

PowerCert Animated Videos is a great YouTube channel that publishes clear and concise explanations of big concepts in computer hardware and networking. Over the last couple of years I regularly used the videos in EDpuzzle to create short introductory assignments for my students.

Default Gateway Explained is the latest video published by PowerCert Animated Videos. The video does a great job of explaining to students why a default gateway is a necessary network component if they want to connect computers to the Internet.



On a related note, here's the PowerCert video about DHCP and here's my demonstration of how to create Edpuzzle activities.




Monday, December 14, 2020

What is a DDos Attack? - A Simple Explanation

Were you one of the millions of people frustrated by Google services like Classroom and Gmail being down earlier today? If so, and you turned to Twitter to see who else was talking about it, you may have noticed that #DDoS was a trending topic as people speculated that perhaps Google was the victim of a DDoS attack. (So far Google has not given an explanation of what caused the outage). 

I had one student in my classroom this morning and the rest were virtual. Since I couldn't reach my virtual students I scrapped this morning's lesson plan and talked with my one in-person student about network and data security. We ended up spending a good bit of time talking about DDoS as it was a trending and relevant topic for my class. Specifically, we did a lot of speculation on the various ways a DDoS attack might get started. 

If you're wondering what the heck a DDoS attack is and why it would be relevant to all users of cloud-based services, take a look at PowerCert's animated explanation of DDoS. It's one of the best "non-techy" explanations I've found.


Update: 10:45am ET Google released a short statement about the outage. It was not related to a DDoS attack. 

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.


Code.org offers a video on the same topic. Code.org'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.