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Saturday, April 14, 2012

DNS (Domain Name System)

DNS (Domain Name System), is the service which translates between Internet names and Internet addresses.
Internet names are the names which we use to refer to hosts on the Internet, such as www.debianhelp.co.uk.
Internet addresses are the numbers which routers use to move traffic across the Internet, such as 211.1.13.115

What are DNS Records ?

DNS records or Zone files are used for mapping URLs to an IPs. Located on servers called the DNS servers, these records are typically the connection of your website with the outside world. Requests for your website are forwarded to your DNS servers and then get pointed to the WebServers that serve the website or to Email servers that handle the incoming email.

Types of DNS Records:

A record: Address record maps a hostname to a 32-bit IPv4 address.

AAAA record: AAAA record IPv6 address record maps a hostname to a 128-bit IPv6 address.

CNAME record: Canonical name record is an alias of one name to another.

MX record: Mail exchange record maps a domain name to a list of mail exchange servers for that domain.

PTR record: Pointer record maps an IPv4 address to the canonical name for that host.Setting up a PTR record for a hostname in the in-addr.arpa domain that corresponds to an IP address implements reverse DNS lookup for that address.

NS record: Name server record maps a domain name to a list of DNS servers authoritative for that domain.

SOA record Start of authority record specifies the DNS server providing authoritative information about an Internet domain.

SRV record: It is a generalized service location record.

TXT record: This record is used to implement the Sender Policy Framework.

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