Domain Name System Notes

The dns is a hierarchical domain based naming scheme and uses a distributed database system for implementing this naming scheme.

Domain name system notes. It associates various information with domain names assigned to each of the participating entities. When the domain name system was created in the 1980s the domain name space was divided into two main groups of domains. Dns packets use an ad hoc compression method in which portions of domain names can sometimes be replaced with two byte pointers to previous domain names. Domain name system study notes a a.

They form the dns root zone of the hierarchical domain name system. Defines how long the rr may be cached before authoritative server should be queried. Most prominently it translates more readily memorized domain names to the numerical ip addresses needed for locating and. The domain name system dns is a hierarchical and decentralized naming system for computers services or other resources connected to the internet or a private network.

The top level domains tlds are the highest level of domain names of the internet. A the domain name system dns is a client server application that identifies each host on the internet with a unique user friendly name. Dns resource record a dns record contains the information queried for value field in the question plus additional information on the record ttl class type of record. To handle this high level readable names were introduced with the dns domain name system.

Notes on the domain name system if you ve seen my reference manuals on internet. The ohio state university raj jain 24 15 name resolution cont each computer has a name resolver routine e g gethostbyname in unix each resolver knows the name of a local dns server resolver sends a dns request to the server dns server either gives the answer forwards the request to another server or gives a referral referral next server to whom request should be sent. The precise rule is that a name can be compressed if it is a response owner name the name in ns data the. The domain name system dns defined in rfcs 1034 and 1035 is used on the internet to provide a standard naming convention for locating ip based computers.

In simple terms a domain name system dns is a collection of databases that translate hostnames to ip addresses. Short for domain name system dns is an internet service that translates domain names to ip addresses domain names are alphabetic and therefore easy to remember but the internet is based on numeric ip addresses so a dns server is required for computers to communicate with one another. Dns organizes the name space in a hierarchical structure to decentralize the responsibilities involved in naming.