There are several reasons to flush your DNS cache every so often. Once TTL has expired for a record, changes need to propagate globally, across all servers, and the entire lookup process begins again. Any recently visited site is cached until time to live (TTL) for the domain’s DNS records have expired. This usually involves several different servers (recursive, root, top-level domain (TLD), and authoritative nameservers), but client-side (your device) requests can also be answered by your browser or the recursive resolver if the information requested is in cache.Ī DNS cache is like a memory bank for website information. ![]() What is DNS Caching and How Does it WorkĪnytime you enter a URL into your web browser, a DNS lookup process is initiated. This applies whether you are using a home or office computer. You’ll also learn the commands to clear your local DNS cache for Windows and Mac. In this blog, I’ll be covering what DNS cache is, how it works, and why you should flush it. Flushing your DNS cache is an easy and helpful way to troubleshoot DNS and connectivity errors, as well as keeping your local cache more secure.
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