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1-DNS is Domain Name System.
2-The main task of DNS is to resolve name to ip and ip to name. If we type www.google.com you will find the google page but you don't know the ip address of google server its http://74.125.228.110/ so when you type this in your browser you can find the same home page. So this one is the main task of DNS its resolve name to ip and ip to name.
Forward and reverse lookup is the process of translating between (your local host ip address like you gave static ip172.21.20.10 ) ip address and internet Domain or Computer name.
let me make simple for you if you are a beginner
Forward Lookup: name to IP
Reverse Lookup: IP to name
For beginners this the best thing to understand.
A. record again i will tell you in simple words. A record is a host name to a static ip or fully logical domain name.
Need simple answer about MX?
its a mail exchange record. Use for email registration you have to register your mac from different service provider. The set of MX record of a domain specifies how email should be routed with the simple mail transfer protocol SMTP.
ok in last go to your command prompt and type nslookup you will find some thing like
Default server:----
Address:--
now type google.com you can find all google ip address
and you can do same thing bye typing one of the google's ip like192..
you will find result google.com so your forward and reverse both are working it will help you to understand DNS .
video will help you more:
http://www.youtube.com/watch?v=ZBi8GCxk7NQ
Many Thanks. Muhammad Tahir
DNS is the service that used to resolve Host Names to Ip address and vice versa, and contain the forward lookup zones that responsable about the main function of dns service as it have A record, SRV,SOA,NS,MX and Cname record , also contain reverse lookup zons the responsable for resolve IP to host name by creating PTR record on it, A record is responsable for main function for DNS as it resolve host name to IP address ,MX record used for mail service
Convert IP numbers to names and also can convert Reverse looking for the name of a computer by name and converts it to IP
DNS : Domain Name system
its a serves used to translate the IP to Domin name this step called Forward lookup , the reverse lookup is to translate the domain name to IP
The Record is the table that save every IP with its domain name
DNS is a Microsoft Database Server it store information about Server, Services etc the mail purpose of DNS is for hostname resolving means when you give the hostname ip tells you about the ip address.
suppos you have a Internet connection and you hit http://www.gmail.com so your machine need to resolve the address of www A record in gmail.com DNS Server.
Forward lookup Zone: is used to Resole Hostname to IP address
Reverse Lookup Zone: is used to Resolve visa virsa means from IP address to Hostname.
A Record is used to tell the Ip addrses of the Host.
MX Record Tells you the Exchange Server IP address.
DNS stands for DOmain Name system.It resolved name to IP and reversly IP to name.
Example: When you ping www.yahoo.com then it resolved to it's IP address 87.248.122.122.
Forward Zone is responsible for resolving Name to IP that is forward lookup
Example:
Default Server: b.resolvers.Level3.net
Address: 4.2.2.2
> yahoo.com
Server: b.resolvers.Level3.net
Address: 4.2.2.2
Non-authoritative answer:
Name: yahoo.com
Addresses: 206.190.36.45
98.138.253.109
98.139.183.24
Reverse Zone is responsible to resolve IP to Name that is reverse lookup.
C:\Users\sysad>nslookup
Default Server: b.resolvers.Level3.net
Address: 4.2.2.2
> set type=PTR
>98.138.253.109
Server: b.resolvers.Level3.net
Address: 4.2.2.2
Non-authoritative answer:
109.253.138.98.in-addr.arpa name = ir1.fp.vip.ne1.yahoo.com
Into Forward Zone you can put different types of record like A,NS,SOA,MX,CNAME,WWW etc.
Into Reverse Zone usually you put PTR record.
A record id just a host record that indicates a host's IP address.You hsould put A record into Forward Zone file
MX record stands Mail Exchanger that uses for Mail Server.It means by MX record you indocate your Mail Server.
Here is a sample Forward Zone File record:
$TTL 86400@
IN SOA centos1.skau.net root.skau.net. (
; Serial
28800 ; Refresh
14400 ; Retry
3600000 ; Expire
86400 ) ; Minimum
IN NS centos1.skau.net.
IN NS centos2.skau.net.
centos1 A 192.168.37.91
centos2 A 192.168.37.92
centos3 A 192.168.37.93
Here is a sample Reverse Zone record
$TTL 86400@
IN SOA centos1.skau.net root.skau.net. (
; Serial
28800 ; Refresh
14400 ; Retry
3600000 ; Expire
86400 ) ; Minimum
IN NS centos1.skau.net.
IN NS centos2.skau.net.
91 IN PTR centos1.skau.net.
92 IN PTR centos2.skau.net.
93 IN PTR centos3.skau.net.
excellent and comprehensive answer by Ehab Shana
It is the Brain of the Network "Domain name system"
