Which statement correctly describes how Ethernet frames leave this port when a Cisco IP phone is cabled to the switch, and a PC is cabled to the phone's access port?
Both data and voice frames are 802.1Q-tagged with their respective VLAN IDs.
Data frames are untagged in VLAN 20, while voice frames are 802.1Q-tagged with VLAN 10.
Data frames are 802.1Q-tagged with VLAN 20, and voice frames are sent untagged.
Both data and voice frames are sent untagged in VLAN 20.
The command switchport voice vlan 10 makes the switch tell the Cisco IP phone (via CDP) to tag all voice frames with VLAN 10 using IEEE 802.1Q. Traffic from the attached PC is still sent untagged and is associated with the port's access VLAN 20. Therefore, only voice frames are tagged; data frames remain untagged. The other options mis-state which frames are tagged or untagged.
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What is the purpose of VLAN tagging in Ethernet frames?
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Cisco CCNA 200-301
Network Access
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