What is a simple config for a switchport to apply QoS. I have a 2960 with a 7960 phone plugged in and a computer plugged into the phone. I'm concerned about not trusting the computer and at the same time trusting the phone. I'm under the impression that 'mls qos trust device cisco-phone' will use CDP to allow the DSCP markings applied by the phone but what about the computer? How do I make sure someone isn't marking their packets manually to gain priority? TIA.