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Thursday, June 17th, 2010 at 5:03 pm

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What is a domain name? What is a domain name server?

Register your name purchase domain and hosting services , you need to buy the domain name resolves at headquarters to see the site's content. In most cases, changing the DNS domain name server, and can not immediately see the site's content, but few hours, or even a day or two to open your site.

To understand why the domain name resolution so long, we must understand the resolution process Domain Name and the DNS server role.

Every computer on the Internet is assigned an IP address, data transfer is actually carried out between different IP addresses. Including the use of computers at home, connect to the Internet in the future have also been assigned an IP address, IP address of most cases, is dynamic. This means you turn the modem off, reopen Internet, Internet access were randomly assigned to a new Chamber of Commerce IP address.

Web Server is essentially a computer station with Internet access, but the setup is more suitable as a server, and the data center to keep the temperature low, the environment in the dust, but there are security measures. These servers use a fixed IP address connected to the Internet.

A resolution of domain names to a server page files on this server, the computer user to know the type of server for the domain name of the page web of information. This is achieved through domain name server.

Domain Name Server is an acronym for English for the name server domain. Each domain name must have at least two DNS servers, so if a DNS server problem, the other can return the data in this domain. DNS server can have more two, but all these DNS servers DNS records must be the same.

In the DNS server to keep a record of the DNS domain name, such as records, records MX. A record is used to specify the hostname (or domain) the corresponding IP address. MX records to resolve mail server name. In many cases.

When a viewer in the browser address box in a name, or click on a link from another site for this domain name, browser access to Internet domain User name to issuing the request, providers of access to database query DNS server domain names, see the domain name's DNS server. Crawl and then the DNS server's DNS records, it is to get the domain name to point at the IP address. Access to IP information, go to the address of the access provider Server IP for the server to track the content, and then transmitted to the requesting browser.

This process is described is quite complex, but in reality less than a second or two to complete.

Domain name resolution takes a long time the reason is that Internet access providers, such as Beijing Telecom Henan and telecommunications, in order to accelerate the pace of the user opens the page, usually in their DNS servers cache the DNS records for the domain of many name. The access provider's customers to open a Web page, the access provider's server domain names to consult the database, but its own cache DNS records to be used directly to accelerate access to the site. This is the advantage.

Drawback is that the Internet cache access providers ISP is stored for a time, only when it is updated as needed, but there is no standard frequency changes. Some ISPs may be updated 1 hour, some may take up to 12 days before the upgrade.

Therefore the registration of new domain names in general, analytical Fandao faster. Given that every ISP is not cached, the user access to query when the ISP is the database domain, get the latest DNS data.

The old name domain changing DNS records, but the rest of the world's data cache is not updated immediately ISP. Users differently in different ISP, and some may be relatively quick access to the new DNS records, and some have to wait for the next update of ISP cache.

Finally, a note the point is that the DNS server and Web server can be the same provider, can also be different. Web hosting providers usually also provide their own DNS server, so the user only to point your domain name web hosting provider's own domain name server on it. Some users like use the domain name service provider's DNS server log, this time the user is in the DNS server, domain registration companies to change DNS records, A, MX records until the IP address of virtual hosting providers.

Want to learn more here: http://myhosting.com

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