DNS query<\/a> can be resolved sooner and subsequent searches farther down the DNS lookup chain can be avoided, resulting in faster load times and lower bandwidth\/CPU consumption. DNS data can be cached in a variety of locations, with each location storing DNS records for a specific amount of time indicated by a time-to-live (TTL).<\/p>\nBrowser DNS caching<\/h3>\n
Modern web browsers are programmed by default to cache DNS entries for a fixed period of time. The goal here is obvious: the closer DNS caching is to the web browser, the fewer processing steps are required to verify the cache and send the appropriate queries to an IP address. When a DNS record is requested, the browser cache is the first place it is searched.<\/p>\n
Operating system (OS) level DNS caching<\/h3>\n
The operating system-level DNS resolver is the second and final local stop before a DNS query leaves your machine. The component within your operating system that handles this query is typically referred to as a “stub resolver” or DNS client. When a stub resolver receives a request from an application, it first examines its cache to determine if the record exists. If not, it sends a DNS query (with a recursive flag) outside the local network to a DNS recursive resolver within the Internet service provider.<\/p>\n","protected":false},"excerpt":{"rendered":"
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