The Domain Name System (DNS) is a hierarchical network that resolves text-based URLs such as "www.cnet.com" to the servers' IP addresses that your computer uses for communication. While loading a single Web page or other Web-based resource, your computer may contact numerous URLs to load different components (a Web page, images on it, an application hosted on it, scripts, etc.), so a robust DNS service is a vital part of having a smooth Internet connection.
Even though a fast DNS service will optimize a connection, redundant queries to it will take time to complete. Therefore, based on your DNS server's configuration OS X will cache its DNS query results for a predetermined amount of time to allow quicker access to the results of recent DNS lookups. This time is usually relatively short -- between a few minutes to a few hours -- but this time depends on the DNS server being used; some may be configured to update the cache at far greater intervals such as a day or longer.
While for the most part the cache should optimize connections and keep your Internet connections running smoothly, there are times when it becomes corrupted or contains out-of-date information and doesn't properly resolve a needed Web resource. Problems with the cache can also lead to a slower browsing experience.
Therefore, if you are experiencing browsing problems, then along with other routines like clearing your browser's cache and troubleshooting network connections, your... [Read more]
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