Domain Name Server


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Domain Name Server

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DNS

(Domain Name System) The Internet's system for converting alphabetic names into numeric IP addresses. For example, when a Web address (URL) is typed into a browser, DNS servers return the IP address of the Web server associated with that name. In this made-up example, the DNS converts the URL www.company.com into the IP address 204.0.8.51. Without DNS, you would have to type the series of four numbers and dots into your browser to retrieve the website, which you actually can do. See IP address.

A Hierarchy of Servers
The DNS system is a hierarchy of duplicated database servers worldwide that begin with the "root servers" for the top-level domains (.com, .net, .org, etc.). The root servers point to the "authoritative" servers located in ISPs, as well as in large companies, that turn the names into IP addresses; the process known as "name resolution." Using our www.company.com example, COMPANY.COM is the domain name, and WWW is the hostname. The domain name is the organization's identity on the Web, and the hostname is the name of the Web server within that domain (see WWW). See DNS records, zone file, reverse DNS, recursive DNS, DDNS, HOSTS file, mDNS, ping, root server and WINS.


Getting a Web Page
Converting the domain name (URL) in a Web browser into an IP address takes numerous queries. Along the way, there can be more name servers than are shown here.







Caching Speeds Up Delivery
If the ABC.COM Web address was previously requested by one of the ISP's customers, its IP address is cached (stored) in the DNS server and returns the IP address immediately. A user's computer also typically caches IP addresses, which can eliminate the DNS query all together if the address is already in the cache.
References in periodicals archive ?
The confirmation page indicated it would take up to seven days to complete the transfer (because the web's domain name servers are typically updated only once a week).
After gaining access to a host PC, the DNSChanger virus tries to modify the DNS (Domain Name Server) settings, which are essential for Internet access, to send traffic to malicious servers.
Once a particular web site is requested, a query is sent to a domain name server, which then redirects that web address to a specific IP address on the web.
Clients in production with 6connect IP address management, Domain Name Server (DNS) and peering automation tools include Tier 1 ISPs, global Enterprises, and international organizations.
DNS Security Extensions (DNSSEC) is a suite of Internet Engineering Task Force (IETF) specifications that adds security to the Internet's Domain Name System (DNS) to provide assurance that the information received from a Domain Name Server is authentic.
According to the company, DNS Security Extensions (DNSSEC) is a suite of Internet Engineering Task Force (IETF) specifications that adds security to the Internet's Domain Name System (DNS) to ensure that the information received from a Domain Name Server is authentic.
n The Icann domain name server network handles 1 trillion transactions a day, translating into 10 million requests per second.
"Your computer has to go to a domain name server. As a user types in a domain name, the browser first of all goes to a server and that server tells it what the actual IP address is."
Appendices and bonus materials on the DVD-ROM cover discussions of network security, virtual private networks, the domain name server, troubleshooting, hardware compatibility, commands, and further sources.
In this case, the attacks are on the navigational structure of the Internet, targeting the domain name server (DNS) system that translates names such as "www.securitymanagement.com" into numeric IP addresses.
"We are aware of reports that Microsoft web properties may have been impacted by a reported outage suffered by Akamai Technologies' domain name server system," Microsoft said in a statement, deferring further inquiries to Akamai.
The Nokia GPRS core includes the Serving GPRS Support Node, the Gateway GPRS Support Node, the Domain Name Server, the Charging Gateway, firewalls and Ethernet switches.

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