Networking Glossary
Search for a term, or jump straight to a letter. A growing reference of the networking terms you will run into most.
About This Glossary
Networking has its own vocabulary, and the same acronym often means different things in different contexts. This glossary collects the terms you are most likely to meet when configuring a home lab, studying for a certification, or troubleshooting a connection at work, with plain-language definitions written for real-world use rather than exam memorization.
Use the search box to filter the list in real time, or use the A–Z bar to jump to a letter. Where a term has a companion tool or explainer on NetworkCheckr, a Learn more link points you to it. The list is updated regularly as new terms are added.
Related Tools & Resources
Put these terms into practice with our free networking tools: find your public IP address, run a DNS record lookup, perform a reverse DNS lookup, look up domain registration with the WHOIS Lookup, calculate subnet details, browse the common network ports reference, or identify hardware via the MAC Address Lookup. New to the layers behind it all? Start with the OSI model explained.