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. 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.Įven though a fast DNS service will optimize a connection, redundant queries to it will take time to complete. The Domain Name System (DNS) is a hierarchical network that resolves text-based URLs such as "to the servers' IP addresses that your computer uses for communication.
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