Prioritizing Traffic - CompTIA Network+ N10-007 Prof Messer
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How often is this used?
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It only kicks in when a pipe has hit saturation. Even if you're at 99% bandwidth, there would be no prioritizing because the packets would just flow in the order they are received.
So the answer is, it totally depends if your pipe is ever saturated.
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In big companies how use VoIP for production for example, this is a most, QoS needs to be very well deployed, to improve users/clients experience using the phone.