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Design goals of DNS. The primary goal is a consistent name space which will be used for referring to resources. Consistent: same names should refer to same resources. Resources: IP addresses, mail servers. Enable Distributed management.
The DNS is a distributed database across a hierarchy of networks of servers and provide ways for devices and software (like browsers and email) to query the DNS to get an IP address. Domain names must be unique. Domain names are used for naming websites and email addresses.
Domain Name System (DNS) enables you to use hierarchical, friendly names to easily locate computers and other resources on an IP network. The following sections describe the basic DNS concepts, including features explained in newer Requests for Comments (RFCs), such as dynamic update, from the Internet Engineering Task Force (IETF).
Domain Name System are usually used to translate a hostname or Domain name (eg. nec.edu.np) into an IP address (eg. 202.37.94.177). Domain name comprise a hierarchy so that names are unique, yet easy to remember.
1 maj 2012 · The Domain Name System (DNS) is a critical component of the global Internet infrastructure. Throughout its history, its design and administration has experienced significant dynamic changes...
The Ohio State University Raj Jain 24- 10 Server Hierarchy (Cont) Authority ⇒ has the name to address translation table Responsible ⇒ Either has the name to address translation table or knows the server who has A single server can serve multiple domains, e.g., purdue .edu and laf.in.us Root server knows about servers for top-level domains, e.g., com
After getting the IP address for a domain name (www.example.net) using DNS protocol, a computer will ask the owner (server) of the IP address to prove that it is indeed www.example.net. The server has to present a public-key certificate signed by a trusted entity and demonstrates that it knows the corresponding private key
