This file is from Wikimedia Commons and may be used by other projects.
The description on its file description page there is shown below.
W3C-validity not checked.
Summary
DescriptionEthernet 802.1Q Insert.svg
English: Diagram showing an Ethernet frame before and after inserting an 802.1Q tag. This is an SVG file created to reproduce the diagram in the image File:TCPIP 802.1Q.jpg.
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the licence, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible licence as the original.