Q-in-Q, also known as VLAN stacking, is a networking technology that allows encapsulating an 802.1Q tagged frame inside another 802.1Q tagged frame. This effectively creates a VLAN within a VLAN, enabling service providers to offer multiple VLAN services to their customers while isolating their traffic. It is commonly used to extend VLAN ranges beyond the standard 4096 limit and to create private networks across a public infrastructure.
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