It translates an often humanly meaningful, text-based identifier to a system-internal, often numeric identification or addressing component. Internet which is used to identify and locate computer systems and resources on the Internet. It allows you to connect to other computers or networks by simple names dns server pdf free download of requiring memorization of IP addresses.
The Internet maintains two principal namespaces: the domain name hierarchy and the IP address system. The Domain Name System maintains the domain namespace and provides translation services between these two namespaces.
Below the root, Internet resources are organized into a hierarchy of domains, administered by the respective registrars and domain name holders. Examples of such mechanisms include DNS zone transfers and file transfer protocols. DNS provides a mechanism whereby the primary for a zone can notify all the known secondaries for that zone when the contents of the zone have changed. The contents of a zone are either manually configured by an administrator, or managed using Dynamic DNS.
NS records for that zone. This is known as a recursive query or recursive lookup. Because they can answer questions more quickly, they also increase the performance of end-user applications that use the DNS.
Internet service providers typically provide caching resolvers for their customers. In addition, many home-networking routers implement caching resolvers to improve efficiency in the local network.
RFC 1034, Domain Names — Concepts and Facilities, P. TFC 781, Internet Protocol — Darma lur Internet Program Protocol Specification, Information Sciences Institute, J.
RFC 1035, Domain Names — Implementation and Specification, P. Clarifications to the DNS Specification. Domain Names – Domain Concepts and Facilities.
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