DNS RECORDS TYPES

HOST(A):REPRESENT A HOST OR COMPUTER ON THE NETWORK.

PTR(POINTER):ALWAYS LOCATED ON REVERSE LOOKUP ZONE,USED FOR IP TO HOST RESOLVING.

SOA(START OF AUTHORITY):IS THE FIRST RECORD IN ANY DNS SERVER,TO AUTHORISE DNS FOR THAT ZONE.

NS(NAME SERVER):IS USED TO IDENTIFY A DNS SERVER ON YOUR NETWORK.

MX(MAIL EXCHANGE):IS REPRESENT AN SMTP MAIL SERVER ON YOUR NETWORK.

SRV(SERVICE LOCATION RECORD):IS LOCATED ON AD INTEGRATED ZONE,TO LOCATE A DOMAIN CONTROLLER ON THE NETWORK AND LOCATE A SERVICE FOR THE DOMAIN CONTROLLER.

CNAME(ALIAS): USED TO REPRESENT A HOST TO ANOTHER HOST

EXAMPLE: IF YOU TYPE GOOGLE.COM
YOU ARE REDIRECTED TO GOOGLE.CO.IN

DNS QUERIES:2 TYPES

RECURSIVE QUERY:
FIND THE RECORDS TO OHTER DNS SERVERS. IF RECORDS IS NOT FOUND TO ITS FORWARD AND REVERSE LOKUP ZONES.

ITERATIVE QUERY:is a query that is dns client ask the dns server to provide the best answer . dns server check its forward lookup zone and reverse lookup zone to search the answer for the query ,if host is not found ,it uses the forwarder to search the result. it lookup its parent domain or even root hits to search the query.