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802 1Q Definition: 802.1Q is a standard for VLAN tagging in Ethernet networks, allowing multiple VLANs to share a single physical network infrastructure.
802.1Q is a standard protocol in networking that provides virtual LAN (VLAN) tagging for Ethernet frames. It allows multiple VLANs to be carried over a single physical network interface, enabling the segregation of network traffic into different logical networks without the need for separate physical networks. This tagging process involves adding a VLAN identifier to the Ethernet frame header, indicating which VLAN the frame belongs to.