Discuss the three main division of the domain name space?
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Domain Name System (DNS) in 2005 serves aglobal Internet far larger and more diverse, in users and in uses, than the relatively small homogeneous network for which it was first deployed in the early 1980s. To meet the needs of this expanded and enhanced Internet, the DNS has developed into a complex socio-technical-economic system comprising distributed name servers embedded in a multilayered institutional framework. This chapter describes the DNS as it exists in 2005 to establish a base for consideration of the future of the DNS and of navigation on the Internet.
The chapter begins with an explanation of how the DNS responds to queries, illustrating the process with a query about the Internet Protocol (IP) address that corresponds to a particular domain name. It then describes the basic architecture of the DNS: its domain name space, its hierarchical structure, its basic programs, and its key standards and protocols. The core of the chapter is a description of the implementation of this architecture at three levels of the DNS hierarchy: the root, the top-level domains, and the second- and third-level domains. The distinctive characteristics of each level are examined first, followed by descriptions of the technical system and its institutional framework. The committee’s conclusions about the current performance of the DNS architecture and the implementation of each level are presented at the end of each section. Open issues affecting the future of the DNS are collected and analyzed in Chapters 4 and 5
The chapter begins with an explanation of how the DNS responds to queries, illustrating the process with a query about the Internet Protocol (IP) address that corresponds to a particular domain name. It then describes the basic architecture of the DNS: its domain name space, its hierarchical structure, its basic programs, and its key standards and protocols. The core of the chapter is a description of the implementation of this architecture at three levels of the DNS hierarchy: the root, the top-level domains, and the second- and third-level domains. The distinctive characteristics of each level are examined first, followed by descriptions of the technical system and its institutional framework. The committee’s conclusions about the current performance of the DNS architecture and the implementation of each level are presented at the end of each section. Open issues affecting the future of the DNS are collected and analyzed in Chapters 4 and 5
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