802.1Q standard. Because the VID is 12 bits long, 4094
unique VLANs can be identified.
The tag is inserted into the packet header making the entire
packet longer by 4 octets. All of the information contained in
the packet originally is retained.
Figure 2-6. IEEE 802.1Q Tag
The EtherType and VLAN ID are inserted after the MAC
source address, but before the originial EtherType/Length or
Logical Link Control. Because the packet is now a bit longer
than it was originally, the Cyclic Redundancy Check (CRC)
must be recalculated.
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