- published: 20 May 2016
- views: 257577
The Domain Name System (DNS) is a hierarchical decentralized naming system for computers, services, or any resource connected to the Internet or a private network. It associates various information with domain names assigned to each of the participating entities. Most prominently, it translates more readily memorized domain names to the numerical IP addresses needed for the purpose of locating and identifying computer services and devices with the underlying network protocols. By providing a worldwide, distributed directory service, the Domain Name System is an essential component of the functionality of the Internet.
The Domain Name System deligates the responsibility of assigning domain names and mapping those names to Internet resources by designating authoritative name servers for each domain. Network administrators may delegate authority over sub-domains of their allocated name space to other name servers. This mechanism provides distributed and fault tolerant service and was designed to avoid a single large central database.
A domain name is an identification string that defines a realm of administrative autonomy, authority or control within the Internet. Domain names are formed by the rules and procedures of the Domain Name System (DNS). Any name registered in the DNS is a domain name. Domain names can also be thought of as a location where certain information or activities can be found.
Domain names are used in various networking contexts and application-specific naming and addressing purposes. In general, a domain name represents an Internet Protocol (IP) resource, such as a personal computer used to access the Internet, a server computer hosting a web site, or the web site itself or any other service communicated via the Internet. In 2014, the number of active domains reached 271 million.
Domain names are organized in subordinate levels (subdomains) of the DNS root domain, which is nameless. The first-level set of domain names are the top-level domains (TLDs), including the generic top-level domains (gTLDs), such as the prominent domains com, info, net, edu, and org, and the country code top-level domains (ccTLDs). Below these top-level domains in the DNS hierarchy are the second-level and third-level domain names that are typically open for reservation by end-users who wish to connect local area networks to the Internet, create other publicly accessible Internet resources or run web sites. The registration of these domain names is usually administered by domain name registrars who sell their services to the public.
A name server is a computer hardware or software server that implements a network service for providing responses to queries against a directory service. It translates an often humanly-meaningful, text-based identifier to a system-internal, often numeric identification or addressing component. This service is performed by the server in response to a service protocol request.
An example of a name server is the server component of the Domain Name System (DNS), one of the two principal name spaces of the Internet. The most important function of DNS servers is the translation (resolution) of human-memorable domain names and hostnames into the corresponding numeric Internet Protocol (IP) addresses, the second principal name space of the Internet which is used to identify and locate computer systems and resources on the Internet.
The Internet maintains two principal namespaces: the domain name hierarchy and the IP address system. The Domain Name System maintains the domain namespace and provides translation services between these two namespaces. Internet name servers implement the Domain Name System. The top hierarchy of the Domain Name System is served by the root name servers maintained by delegation by the Internet Corporation for Assigned Names and Numbers (ICANN). Below the root, Internet resources are organized into a hierarchy of domains, administered by the respective registrars and domain name holders. A DNS name server is a server that stores the DNS records, such as address (A, AAAA) records, name server (NS) records, and mail exchanger (MX) records for a domain name (see also List of DNS record types) and responds with answers to queries against its database.
Without the DNS, your browser wouldn't even know which website you're trying to visit! Learn all about how it works. Freshbooks message: Head over to http://freshbooks.com/techquickie and don’t forget to enter Tech Quickie in the “How Did You Hear About Us” section when signing up for your free trial. Follow: http://twitter.com/linustech Join the community: http://linustechtips.com License for image used in this video: https://creativecommons.org/licenses/by/2.5/legalcode
Learn the ins and outs of how the Domain Name System (known as DNS by the cool kids), takes a name like dnsmadeeasy.com and translates it into an IP address to find content on the web. Try DNS Made Easy free for 30 days with absolutely no obligation to buy, or credit card info required: http://www.dnsmadeeasy.com/r/22
Info Level: Beginner Presenter: Eli the Computer Guy Date Created: March 13, 2013 Length of Class: 19:17 Tracks Servers Networking Prerequisites Introduction to Networking Purpose of Class This class teaches students the basic concepts for network DNS (Domain Name Services). Class Notes DNS is the Server Service that Maps Hostnames/ Domain Names to IP Addresses DNS and DHCP are different services that are generally hosted on the same server, but can be hosted on separate servers Dynamic DNS allows DHCP to automatically add Name and IP Address mapping to DNS tables. Most techs will work with DNS built into Small Business/ Home Routers or ISP Modems. Other variations of DNS are provided by Windows Servers or BIND which is used on Unix and Linux servers. A DNS implementation may ...
This is an animated DNS tutorial showing what a DNS server is and how it works. It explains the different levels of DNS, such as the resolver, root server, domain server, and authoritative name server.
DNS Tutorial हिंदी में डीएनएस (डोमेन नाम प्रणाली) by Jagvinder explains What is DNS Server in Hindi. DNS Server Tutorial explains basic concepts of DNS Domain name system in hindi.
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Short animated video explaining how the Domain Name System, or DNS, works.
When your browser tries to load youtube.com, how does it know where to contact YouTube's web servers? This video explains the basics of the Domain Name System, an application layer protocol that serves as the address book of the internet.
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A DNS Rebinding exploit how to. This exploit has caused much confusion, so this video explains how hackers can take advantage of this attack and why the security world will probably not be fixing it any time in the near future.
Learn the ins and outs of how the Domain Name System (known as DNS by the cool kids), takes a name like dnsmadeeasy.com and translates it into an IP address to find content on the web. Try DNS Made Easy free for 30 days with absolutely no obligation to buy, or credit card info required: http://www.dnsmadeeasy.com/r/22
DNSMap vs Fierce2 vs Metasploit (dns_enum) A crucial step to any pentest, or information gathering session is DNS enumeration. This video shows you how 3 tools excel or fail at what they were designed to do.
Este es un video tutorial de Sistemas operativos II, en este estaremos guiando paso a paso la instalacion de un servidor DNS en el ambiente de Windows Server 2003.
You placed your hand in mine
And I saw you smile
We walked for a while
Until the sun disappeared behind
I love to hear you sing
The way you laugh at me
We sat in that old swing,
And you say you'll never leave
Chorus: Then I woke up, It was just a dream
You are not here, I think I'll go right back to sleep
You looked so real to me
You made me believe
That I was all you'd need
And you set my poor heart free
You told me you were mine
We left the past behind
No more lonely nights and
I was happy for a while