A network administrator is configuring an Ethernet switch port that will connect to a VoIP desk phone. The phone has a built-in switch so that a user's PC can share the same cable run. Which port configuration will provide separate traffic handling for the phone and the PC while using only one physical interface on the switch?
Assign only a voice VLAN to the interface and leave data untagged on the default VLAN
Enable Auto-MDI/MDI-X with portfast and leave the VLAN assignment at the default
Set the interface to access mode on the data VLAN and configure a separate voice VLAN
Configure the interface as a trunk port and allow all VLANs, including voice and data
Configure the port as an access port for the data VLAN and add a voice VLAN. An access port carries one untagged VLAN (for the PC's frames) and can be instructed, via the voice-VLAN command or LLDP-MED, to accept 802.1Q-tagged frames from the IP phone on a separate VLAN. This keeps data and voice traffic logically separate, allows QoS policies to prioritize voice, and prevents users from plugging in a device that could exploit a true trunk. Simply assigning a default VLAN, configuring only the voice VLAN, or changing speed/duplex does not meet the requirement to transport both traffic types securely and efficiently.
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What is a VLAN and why is it important for network management?
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