IP Precedence and DSCP Values

Hi Rene, Another great explanation, kudos ! i have 2 doubts though :

First one may seem stupid but i will ask:-)

  1. When we say , audio traffic / video traffic and talk about assigning them separate DSCP value based on our priority - how do we achieve that, because ultimately both type of traffic is coming from same host / IP Address and if I am not wrong , underlying we use IP address to create class-map/policy-map etc from config pint of view. so if IP is same from where audio/video traffic being generated, how do we separate them at switch for assigning different dscp values ?

  2. Now in real world as a network engineer, if we are asked to design QoS to make sure our voice/video application (Skype for business in my case) is working perfectly fine in the network consist of Cisco switch / router
    what parameters / configs/ concept i need to worry ? a holistic answer of it will really help.

thanks