Plain-language definitions of common router, Wi-Fi, and internet terms.

Reviewed for clarity and general compatibility. Router menus vary by model and firmware.

How to use the networking glossary

Networking terms are most useful when connected to a real troubleshooting decision. A default gateway identifies the local router, DNS translates names, DHCP assigns local settings, NAT translates private addresses, and a subnet mask defines which destinations are local. Follow the links between terms instead of treating each definition as an isolated acronym.

Start with these concept groups

  • Addressing: IP address, subnet mask, default gateway, DHCP and DNS.
  • Wireless: SSID, bands, channel width, beamforming, MU‑MIMO, OFDMA and band steering.
  • Routing and security: NAT, port forwarding, firewall, UPnP, VPN and remote administration.

When diagnosing a problem, identify the layer first. A device without a valid IP points toward DHCP or local connectivity; a device with an IP but no name resolution points toward DNS; a healthy local network with no upstream route points toward the WAN or provider.

Final verification step

Use the glossary alongside the troubleshooting pages: definitions explain what a component does, while the guides show how to test it. When two terms seem similar, compare where each operates in the packet path and what evidence would distinguish them.