350-801 CLCOR: Implementing and Operating Cisco Collaboration Core TechnologiesDemo

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QuestionQ107

Infrastructure and Design

An engineer needs to configure switch port 5/1 to send CDP packets that configure a connected Cisco IP phone to trust tagged traffic on its access port. Which command is required to finish the configuration?

Router# configure terminal -  
Router(config)# interface gigabitethernet 5/1  
Router(config-if)# description Cube E42.421-5965
  • A platform qos trust extend cos 3
  • B platform qos extend trust
  • C platform qos trust extend
  • D platform qos trust extend cos 5
Explanation

Cisco’s trusted-boundary feature is configured with platform qos trust extend. When no cos keyword or CoS value is supplied, CDP instructs the attached Cisco IP phone to trust tagged traffic received from the device connected to the phone’s access port. Supplying cos instead configures marking behavior.

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