On an 802.1Q trunk, the native VLAN is the one VLAN whose frames are transmitted without an 802.1Q tag. When either switch receives an untagged frame on the trunk, it automatically associates that frame with its locally configured native VLAN. All other VLANs are tagged, and the native VLAN must match at both ends to prevent traffic leaks.
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Cisco CCNA 200-301
Network Access
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