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Portions of the network which are VLAN-aware ( i. e., IEEE 802. 1Q conformant ) can include VLAN tags.
Traffic on a VLAN-unaware ( i. e., IEEE 802. 1D conformant ) portion of the network will not contain VLAN tags.
When a frame enters the VLAN-aware portion of the network, a tag is added to represent the VLAN membership of the frame's port or the port / protocol combination, depending on whether port-based or port-and-protocol-based VLAN classification is being used.
Each frame must be distinguishable as being within exactly one VLAN.
A frame in the VLAN-aware portion of the network that does not contain a VLAN tag is assumed to be flowing on the native ( or default ) VLAN.

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