Understand the Domain Name System

Ever wonder why DNS systems formed? Efficiency. Each computer has its own IP address and the Internet needed an elite method for obtaining this mail and for managing the system as a whole. Enter ICANN.

The Internet Corporation for Assigned Names and Number manages the root domain of the DNS namespace of the Internet. ICANN is responsible for managing the assignment of identifiers to ensure that all users have unique names.

The DNS system is a series of run-The servers called DNS servers. ICANN manages the root DNS domains, which are among the top-level domains.
It also manages:

Organizational Domains
Geographic Domains
Reverse domain

Under the top-level domains Nominet other authorities, such as name, the name of the British.

How does a DNS query?

The process takes place in two parts. Name query begins at a client computer and is passed to DNS client serviceResolution. If the query can not be resolved locally, DNS servers are queried.

For example, if you http://www.discountdomainsuk.com Web browser requires the Fully Qualified Domain Name, the request is passed to the service, the DNS client to clarify information about the names of the local cache to help with. If the query is held in cache, the process is completed.

But if the query can not be resolved locally, the DNS client service uses a server list (ordered in sequence)to query external DNS server. If a DNS server receives a query, first check if it is authoritative for the domain name. If it is authoritative, it resolves the name, and the process is complete.

If the DNS server can resolve the query was raised in the query other DNS servers through a process known as recursion. DNS server to use root hints to find the DNS servers that are able to provide the desired result, support. In this way, DNS queries are minimized andThe Internet is able to operate quickly and effectively.

A typical query may run as follows:

Client contacts Nameserver A looking http://www.discountdomainsuk.com.

A name server checks its cache, but can not answer, you ask a server authoritative for the root of the Internet.

The root server responds with a reference to a server authoritative for the. Com domains. Name server requests. COM server receives and on the server of choice for businesseshttp://www.discountdomainsuk.com.

A name server query to this server and gets 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 real, positive, negative or referral in nature. In the case of negative answer, another DNS server is queried.

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