[ ] Whatever, normal traffic.
[ ] Let this traffic be throttled at will (downloading latest Linux distro)
[ ] I need low-latency or else throw it away (VoIP)
[ ] I'd like low latency, but still do packets in order (SSH session)
[ ] Please give me a channel of X quality for the next 2 hours, or don't provide it to me at all (Netflix)
A great description is here: http://packetpushers.net/how-does-qos-work/
If that information isn't there, then the packets are treated as "best effort" (or at least, they should be in a sane world).
[ ] Whatever, normal traffic.
[ ] Let this traffic be throttled at will (downloading latest Linux distro)
[ ] I need low-latency or else throw it away (VoIP)
[ ] I'd like low latency, but still do packets in order (SSH session)
[ ] Please give me a channel of X quality for the next 2 hours, or don't provide it to me at all (Netflix)