Which IEEE standard enables the transmission of multiple VLANs across a single Ethernet link between switches?
802.1Q
802.1X
ISL
802.3ad
802.1Q is the IEEE standard that defines the method for frame tagging to support VLANs over trunk links between network devices. It inserts a VLAN tag into the Ethernet frame header, allowing switches to identify which VLAN a frame belongs to, thereby permitting multiple VLANs to share a single physical link.
ISL (Inter-Switch Link) is a Cisco proprietary protocol for VLAN tagging but is no longer widely used. 802.1X is a standard for port-based Network Access Control (NAC) and deals with authentication, not VLAN tagging. 802.3ad refers to link aggregation for combining multiple physical links into one logical link, but it does not handle VLAN tagging.
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