In 802.1Q trunking, the native VLAN is designated to carry untagged frames across the trunk link. Frames that arrive without a VLAN tag are assumed to belong to the native VLAN, ensuring seamless communication with devices that do not support VLAN tagging. This mechanism does not block unassigned traffic, nor is it specifically reserved for voice or management traffic unless explicitly configured.
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Cisco CCNA 200-301
Network Access
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