The VID (VLAN Identifier) is bits, giving possible values. VID means the frame is priority-tagged only with no VLAN assignment. VID is reserved and cannot be used. This leaves VIDs through for your use. When a switch receives a tagged frame, it reads the VID to determine which VLAN the frame belongs to and then forwards it. You'll typically use extended range VIDs (-) only in larger enterprise environments.
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$ curl repovive.com/roadmaps/network-design/switching-and-vlans/vid-field-details
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