Ethernet
Every server, switch, and cloud datacenter runs on Ethernet. Understanding frames, MTU, VLANs, and flow control prevents subtle performance and networking bugs.
What It Defines
Defines wired Ethernet: frame format, MAC addressing, link-layer framing, and physical layer signaling for speeds from 10 Mbps to 400 Gbps. The 2022 edition consolidates all previous amendments including 10GbE, 40/100GbE, and 400GbE.
Canonical (Normative)
Convenient (Practical)
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
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.
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.