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What Exactly Is Quality of Service? Quality of Service is an excellent and underutilized tool that allows you to train your router to divvy up your available bandwidth between applications. With good QoS rules, you can ensure that your streaming video doesn’t stutter because a big file is downloading at the same time, or that your work laptop isn’t sluggish when you’re trying to meet that last minute deadline while your kids are playing games online. It may help to think about Quality of Service like this: Let’s pretend, for a moment, that your Internet connection is a hospital where the available bandwidth is the number of doctors available to treat patients. The patients are the different applications, and the triage nurse is the router.

On a normal network, the triage nurse is indifferent to the condition of the incoming patients and simply assigns them to any available doctors, progressively spreading the staff of the hospital thinner and thinner with no regard for the severity of the patient’s situation. Accidentally shot your hand with a nail gun during a DIY project? You get a doctor immediately.

Someone just got run over by a truck? They get a doctor immediately too. Somebody else shows up with a broken arm? They get a doctor too (but if it’s getting really busy pretty soon people are sharing doctors and nobody is getting particularly speedy care). You can see how, in short order, the hospital would be a bogged down mess and high-priority patients wouldn’t be getting high-priority care. The same thing happens on your network at home–bandwidth is given out as needed, without much regard for what each application is doing. This means if you’re on a Skype conference call with your boss and your kids start watching Netflix, the quality of your Skype call can drop.

The router is doing its best to share the available bandwidth between the two services, not really considering which is “more important”. QoS visualized with a service-based priority model. Quality of Service, to return to our hospital analogy, is like a very competent triage nurse who directs patients to the right doctor in the most efficient way: the guy who just got run over by the truck will get multiple doctors and the guy sitting there with the nail stuck in his hand from the bird-house-project-gone-wrong will wait a moment and get a single doctor when he’s seen. Networks with a Quality of Service model applied will prioritize, as you tell it, certain applications, services, and/or users over others so the important things (Netflix, Skype calls, your Xbox Live connect, etc.) have the most bandwidth and the best ping time.