In an 802.1Q trunk, the native VLAN (Virtual Local Area Network) carries untagged frames across trunk links. By default, this is VLAN 1, but it can be changed to any VLAN. This allows devices that do not support VLAN tagging to communicate over the network. Therefore, its main purpose is to transport untagged frames over trunk links and can be configured to use a different VLAN identifier. The other options are incorrect because the native VLAN is not specifically designated for management traffic, does not provide a path for voice traffic requiring quality of service, and does not tag all network traffic over trunk links.
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Why are untagged frames transported in the native VLAN of an 802.1Q trunk?
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Cisco CCNA 200-301
Network Access
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