VLAN Tagging
VLANs are how you segment networks in every datacenter and enterprise. You'll hit 802.1Q any time you configure a switch, provision cloud VPCs, or troubleshoot inter-tenant isolation.
What It Defines
Defines the 802.1Q VLAN tag inserted into Ethernet frames to carry VLAN ID (12-bit, 4094 VLANs) and priority (802.1p CoS). Enables network segmentation without physical separation, carrier Ethernet (QinQ/802.1ad), and STP integration.
Canonical (Normative)
The world's largest technical professional organization. IEEE 802 LAN/MAN Standards Committee publishes Ethernet (802.3), Wi-Fi (802.11), VLAN tagging (802.1Q), and port-based NAC (802.1X). Standards require purchase but are the normative reference for all wired/wireless networking.
Related Specs
Every server, switch, and cloud datacenter runs on Ethernet. Understanding frames, MTU, VLANs, and flow control prevents subtle performance and networking bugs.
802.1X is how enterprises authenticate devices before allowing network access. Required knowledge for corporate Wi-Fi, VPN alternatives, and zero-trust network access designs.