Ever wonder why DNS systems came? Efficiency. Each computer has its own IP address, and the Internet needed an elite method for obtaining these addresses and for managing the system as a whole. Enter ICANN.
The Internet Corporation for Assigned Names and Number manages the DNS root of the area of Internet domain names. ICANN is the role of assigning identifiers to manage, to ensure that all users have unique names.
The DNS system is runby a series of servers called DNS servers. ICANN manages the DNS root domains, including top-level domains.
It also manages:
Organizational domains
Geographic areas
Reverse domain
Among the top-level domains are other naming authorities such as Nominet, the Naming Authority of the United Kingdom.
How does a DNS Query work?
The process takes place in two parts. First, a name query begins at a client computer and is passed to DNS Client service for resolution. If the query can not be resolved locally, DNS servers queried.
For example, when a web browser calls the fully qualified domain http://www.discountdomainsuk.com, the request is passed to the DNS Client service is the name of solving using a cache data locally. If the query is held in the cache, then the process is complete.
However, if the query can not be resolved locally, the DNS client service uses a list server> (ordered in sequence) to query external DNS server. When a DNS server receives a query, first check if that domain name. If it is authoritative, it resolves the name and the process is complete.
If the DNS server is unable to resolve a query, in turn, ask other DNS servers, using a process known as recursion. DNS Server use root hints to assist in locating> Server DNS, which are able to provide the required result. In this way, applications are minimized and the Internet DNS is able to operate effectively and quickly.
A typical query may run as follows:
Client contacts Nameserver A looking http://www.discountdomainsuk.com.
A name server checks the cache, but can not answer, so ask an authoritative server for the web root.
The root server responds with a reference to a server authoritative for the. com domains. Queries the name server. COM server and gets referred to the authoritative server for http://www.discountdomainsuk.com.
A request for a name server and the server receives the IP address for http://www.discountdomainsuk.com.
A name server responds to the client with the IP address.
Queries can return answers that are authoritative, positive, negative or referral in nature. In the case of negative answer, another DNS> Server is required.
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