TAILIEUCHUNG - DNS Architecture

DNS architecture is a hierarchical distributed database and an associated set of protocols that define: •A mechanism for querying and updating the database. •A mechanism for replicating the information in the database among servers. •A schema of the database. DNS originated in the early days of the Internet when the Internet was a small network established by the United States Department of Defense for research purposes. The host names of the computers in this network were managed through the use of a single HOSTS file located on a centrally administered server | DNS Architecture DNS architecture is a hierarchical distributed database and an associated set of protocols that define A mechanism for querying and updating the database. A mechanism for replicating the information in the database among servers. A schema of the database. DNS originated in the early days of the Internet when the Internet was a small network established by the United States Department of Defense for research purposes. The host names of the computers in this network were managed through the use of a single HOSTS file located on a centrally administered server. Each site that needed to resolve host names on the network downloaded this file. As the number of hosts on the Internet grew the traffic generated by the update process increased as well as the size of the HOSTS file. The need for a new system which would offer features such as scalability decentralized administration support for various data types became more and more obvious. The Domain Name System introduced in 1984 became this new system. With DNS the host names reside in a database that can be distributed among multiple servers decreasing the load on any one server and providing the ability to administer this naming system on a per-partition basis. DNS supports hierarchical names and allows registration of various data types in addition to host name to IP address mapping used in HOSTS files. Because the DNS database is distributed its potential size is unlimited and performance is not degraded when more servers are added. The original DNS was based on Request for Comment RFC 882 Domain Names Concepts and Facilities and RFC 883 Domain Names-Implementation and Specification which were superseded by RFC 1034 Domain Names-Concepts and Facilities and RFC 1035 Domain Names-Implementation and Specification . Additional RFCs that describe DNS security implementation and administrative issues later augmented the original design specifications. The implementation of DNS Berkeley Internet Name Domain

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