Topic summary
DNS cache
Extracted from the Wikipedia article Name server.
Caching name server
A caching name server or DNS cache is usually a recursive resolver that stores DNS query results for a period of time determined in the configuration (time-to-live) of each domain-name record. DNS caches improve the efficiency of the DNS by reducing DNS traffic across the Internet, and by reducing load on authoritative name-servers, particularly root name-servers. Because they can answer questions more quickly, they also increase the performance of end-user applications that use the DNS.