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In this edition of Geek School, we are going to look at how IP addressing works. We will also cover some advanced topics like how your PC determines if the device you are communicating with is on the same network as you. We will then finish with a brief look at two name resolution protocols: LLMNR and DNS.

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It’s one thing to just hit up SpeedTest.net to get a rough idea of your internet connection speed, but what if you want to conduct more extensive testing over time to see if you’re really getting your money’s worth from your ISP?

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Strange things occur when an object travels close to the speed of light. Time and distance are both affected by motion as that object moves along the line of sight in the direction it is moving. Got your curiosity piqued? Learn more in this fascinating video discussion about relativity, time dilation, and the Lorentz contraction from Sixty Symbols.

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There’s probably no reason to have Wi-Fi enabled if your device is sitting there unused – and your battery life will be improved if your tablet isn’t constantly syncing in the background anyway.

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Have you seen that message in Windows 8 that tells you your computer is going to reboot and there is not a thing you can do about it except save your work? Here’s how to make sure that never happens again. This tip works for Windows 7 as well.

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Firefox provides several ways for other programs on your computer to install Firefox extensions, sometimes without your explicit consent. While you can disable these extensions, you often can’t uninstall them via Firefox’s Add-ons screen.

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There are numerous modern apps that are a built into Windows 8 and they are featured prominently on the Start screen. It may well be the case that you don’t want to use them because they just aren’t apps you’re interested in, or it may be that you have found a better alternative.

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Internet Explorer is a complex piece of software and hasn’t always been the browser choice of us geeks, but the truth is that it has gotten a lot better over the years so come and see what it has to offer.

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Do you know what antimatter is or believe in its existence? What do you think its impact is or could be on the matter that is so ‘obviously’ prevalent throughout the universe? Learn what is known about antimatter thus far and what scientists are doing to learn more in this great video from SciShow.

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If you want to setup SSH keys to allow logging in without a password, you can do so with a single command. It’s quite easy.

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The Raspberry Pi makes a nice compact platform to attach an indicator light to for all sorts of projects—weather notification, new emails, etc. Read on as we show you how to hook up an LED module to your Pi and set up some basic notifications.

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In past versions of Windows Server, after using the GUI to add the Active Directory binaries to your server, you would use DCPromo to promote your server into a Domain Controller. However, DCPromo was deprecated with the release of Server 2012.

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The tech press is constantly writing about new and dangerous “zero-day” exploits. But what exactly is a zero-day exploit, what makes it so dangerous, and – most importantly – how can you protect yourself?

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The Caps Lock key is outdated and mostly useless. Most people will only ever trigger it accidentally. Google replaced the Caps Lock key with a Search key on its Chromebooks, and you can do the same thing on Windows.

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The Growl notification system is something that will be familiar to Mac users, but it is something that is also available for Windows. It is an incredibly versatile tool that can be used to monitor system and program notifications in a variety of ways, including remotely.

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Every time I see somebody using an file picker to choose a file for upload, I shake my head. There’s a much simpler way to do it – just drag and drop it onto the upload form. This works really well on almost all social media sites, but it even works on old-school forms.

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Have you ever bought an app from the Store only to have Windows tell you that you haven’t purchased the app when you check on another device?

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