You are required to configure the fa0/1, fa0/10 and fa0/11 ports on the Cisco Catalyst 2950 switch according to the following:
On port fa0/1, trust all incoming DSCP settings.
On port fa0/11, trust all incoming CoS settings.
On port fa0/10, trust the incoming CoS setting only if a Cisco IP Phone is connected to the fa0/10 port: otherwise do not trust any CoS or DSCP markings coming in.
The Answer:
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2950-SWITCH>en
2950-SWITCH#config terminal
2950-SWITCH(config)#cdp enable
2950-SWITCH(config)#interface fastethernet0/1
2950-SWITCH(config-if)#mls qos trust dscp
2950-SWITCH(config-if)#no sh
2950-SWITCH(config-if)#interface fastethernet0/11
2950-SWITCH(config-if)#mls qos trust cos
2950-SWITCH(config-if)#no sh
2950-SWITCH(config-if)#interface fastethernet0/10
2950-SWITCH(config-if)#mls qos trust device cisco-phone
2950-SWITCH(config-if)#no sh
2950-SWITCH(config-if)#end
2950-SWITCH#show mls qos interface fastethernet0/1
2950-SWITCH#show mls qos interface fastethernet0/11
2950-SWITCH#show mls qos interface fastethernet0/10
2950-SWITCH#copy running-config startup-config
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If you want to learn more, you can visit:
http://www.cisco.com/en/US/docs/switches/lan/catalyst2940/software/release/12.1_22_ea2/configuration/guide/swqos.html
That is all, hope to helpful for you. Best Luck for ur QoS 642-642 Exam.
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