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Definition

Domain name system is a directory of domain names for computers, services, or other resources which are connected to the internet or any other private network. They are an Internet equivalent of a telephone directory that translates domain names into IP addresses. Domain names are easy to remember since they are alphabetic, but systems use IP addresses to access websites. Thus, a Domain name system functions to decipher these domain names to IP addresses. This helps in identifying and locating computer services and devices with the masked network protocols.

Importance of DNS

Domain name system plays a crucial part in the internet world by providing a distributed directory service. All the information from the domain names are stored in the Central Registry, and many service providers interact with the central registry to get updated DNA information.

The Domain name system mandates the crucial task of allotting domain names and mapping those names by classifying authoritative name servers for each domain for the internet resources. The DNS functions more of like a network, when one DNS server doesn’t translate a particular domain name, it requests another, and so on, until the correct IP address is traced. The DNS avoids a single sizeable central database and facilitates a fault-tolerant service.

The Domain name system can also function as a general purpose database and is helpful in confronting the spam email. Start of Authority (SOA), IP addresses (A and AAAA), name servers (NS) and domain name aliases (CNAME) store records in DNS database. These are used for lookups, or for queries regarding individuals.

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