- DNS stands for Domain Naming System.
- DNS is a internet service used to translating the domain name into IP address.Based on this IP address only identify the websites.
- When compared to the IP address,domain name is easier to remember.Because, Domain name contains with alphabets and IP address contain numbers.
- For, Example WWW.GOOGLE.COM is the domain name and its IP address is 8.8.8.8.
DNS Server :
- DNS server is the also a web server which is used to identify the related website IP address based on domain name.
- There are thousands of domain name servers which forms the domain name system.
Why DNS is important ?
- DNS is like phone book.If you want to talk with anyone then simply open phone book and search that person name then it will give you related number.Like that only DNS also.
Hierarchy of DNS domains :
The DNS server is arranged as following :
- Root level.
- Top level domain's.
- Sub-level domain's.
- Sub-domain.
- Host.
Root level DNS :
- The DNS root zone is the highest level in the DNS hierarchy tree.
- The root nameservers are very important because they are the first step in resolving a domain name.
- Organizational hierarchy such as .com, .net, .org.
- Geographic hierarchy such as .uk, .fr, .pe.
Top level domain's :
- The next level in the DNS hierarchy is Top level domains. There are many TLDs available at the moment. As we have seen the TLDs are classified as two sub categories. They are organizational hierarchy and geographic hierarchy.
Second level domain's :
- This is the main part of the domain name. It can vary according to the buyer.
- Once the domain is available anyone can purchase it. If the domain is unavailable at the moment, same 2nd level name with other tlds is the best option.
Sub domain :
- The sub-domain can be defined as the domain that is a part of the main domain. The only domain that is not also a sub-domain is the root domain.
DNS working procedure :
Examples :
