Configuration for Cisco IP Phone on Cisco Switch - Exam 200-125: Cisco Certified Network Associate Exam

Configuration for Cisco IP Phone

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Configuration of which option is required on a Cisco switch for the Cisco IP phone to work?



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A. B. C. D.


The correct answer to this question is B. the interface as an access port to allow the voice VLAN ID.

Cisco IP phones require access to both data and voice VLANs for communication. The voice VLAN is a separate VLAN used for voice traffic, while the data VLAN is used for data traffic. By default, a Cisco switch port is configured as a trunk port, which carries both data and voice VLAN traffic.

To configure a switch port for a Cisco IP phone to work, the port needs to be configured as an access port to allow only the voice VLAN ID. This ensures that the phone can communicate with the voice VLAN and receive the necessary Quality of Service (QoS) settings.

Here are the steps to configure a switch port for a Cisco IP phone:

  1. Configure the port as an access port:
interface fastEthernet 0/1 switchport mode access
  1. Specify the voice VLAN ID:
interface fastEthernet 0/1 switchport access vlan <voice-vlan-id>
  1. Configure QoS settings:
mls qos trust cos

By configuring the switch port in this way, the Cisco IP phone is able to access the voice VLAN and communicate with other devices on the network.