You need to trunk several VLANs between two Catalyst 9300 switches using only one Gigabit-Ethernet cable. Which IEEE standard defines the frame-tagging method that lets multiple VLANs traverse that single physical link?
802.1X
802.1Q
ISL
802.3ad
802.1Q is the IEEE standard that inserts a VLAN tag into the Ethernet frame header, allowing switches to identify the VLAN to which each frame belongs. This tagging permits multiple VLANs to share one trunk link. ISL is Cisco-proprietary and largely deprecated. 802.1X provides port-based network access control, not VLAN tagging. 802.3ad (now 802.1AX) specifies link aggregation for combining physical links into one logical link and does not perform VLAN tagging.
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