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This Concept Map, created with IHMC CmapTools, has information related to: Chaper 9 DNS, DNS- The Internet Domain Name System Scales to millions of computers -Partitioned database -caching, DNS- The Internet Domain Name System Rapidly resolves domain names to IP addresses -Exploits caching heavily -Typical query time ~100 milliseconds, DNS- The Internet Domain Name System A distributed naming database Name structure reflects administrative structure of the Internet, DNS server functions and configuration Other functions: -get mail host for a domain -reverse resolution- get domain name form IP address -Host information- type of hardware and OS -Well-known services- a list of well-known services offered by a host -Other attributes can be included (optional), DNS server functions and configuration Main function is to resolve domain names for computers, to get their IP addresses -Caches the results of previous searches until they pass their 'time to live', DNS- The Internet Domain Name System Resilient to failure of a server -replication