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How does QoS and Queueing work?

Hello,

I am new to QoS/Networking and I have a few questions so I hope you can help me.

1. ToS is older than DiffServ so how does the router know that the bits are set by DiffServ and not ToS?
2. Why should I use L3 prioritization instead of L2? If I have Switches on the way from the frame I have to use L2 priorization right?
3. Do I need L2 and L3 priorization if I use Router and Switches or is the Router able to interpret  the 802.1p CoS Tags, too?
4. I don't understand the way how Cisco Switches are queueing traffic. I read about some specification like "1P4Q4T". I know it's about priority- and standart queues and bandwith thresholds but how does they work?
4.1 How do you define the bandwith thresholds? What does 4 thresholds mean?
4.2 How are the Queues used if I don't use QoS?
4.3 How are the queues used if I prioritize 1 VLAN?

I watched a few tutorials and read a lot in the world wide web but I haven't found the answers, yet. I hope you can help me.

 

Best Regards,

Veit

 

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Beginner

Did nobody have an answer for those questions?

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