Which configuration tells a switch port to send Cisco Discovery Protocol packets that configure an attached Cisco IP phone to trust tagged traffic that is received from a device that is connected to the access port on the Cisco IP phone?
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A. B. C. D.A.
The correct configuration command that tells a switch port to send Cisco Discovery Protocol (CDP) packets that configure an attached Cisco IP phone to trust tagged traffic received from a device connected to the access port on the Cisco IP phone is option D:
pythonRouter# configure terminal Router(config)# interface gigabitethernet 5/1 Router(config-if)# platform qos extend trust This command enables CDP to configure the attached Cisco IP phone to trust the CoS (Class of Service) value received on packets from a device connected to the access port on the phone.
Here is an explanation of the various configuration commands:
Option A: "platform qos trust extend" command tells the switch port to trust the QoS (Quality of Service) configuration on incoming packets and to extend this trust to the next device. However, this command does not specifically configure the switch port to send CDP packets that configure the IP phone to trust tagged traffic received from a device connected to the access port on the phone.
Option B: "platform qos trust extend cos 3" command tells the switch port to trust the CoS value of 3 on incoming packets and to extend this trust to the next device. However, this command does not specifically configure the switch port to send CDP packets that configure the IP phone to trust tagged traffic received from a device connected to the access port on the phone.
Option C: "platform qos trust extend cos 5" command tells the switch port to trust the CoS value of 5 on incoming packets and to extend this trust to the next device. However, this command does not specifically configure the switch port to send CDP packets that configure the IP phone to trust tagged traffic received from a device connected to the access port on the phone.
Option D: "platform qos extend trust" command tells the switch port to send CDP packets that configure the attached Cisco IP phone to trust the CoS value received on packets from a device connected to the access port on the phone. This command also extends the QoS trust to the next device. Hence, option D is the correct answer.