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An application layer protocol defines how the application processes running on different systems, pass the messages to each other.

DNS is a TCP/IP protocol used on different platforms. The domain name space is divided into three different sections: generic domains, country domains, and inverse domain.

Computer Network DNS

Generic Domains

Label Description
aero Airlines and aerospace companies
biz Businesses or firms
com Commercial Organizations
coop Cooperative business Organizations
edu Educational institutions
gov Government institutions
info Information service providers
int International Organizations
mil Military groups
museum Museum & other nonprofit organizations
name Personal names
net Network Support centers
org Nonprofit Organizations
pro Professional individual Organizations
Computer Network DNS

Country Domain

The format of country domain is same as a generic domain, but it uses two-character country abbreviations (e.g., us for the United States) in place of three character organizational abbreviations.

Inverse Domain

The inverse domain is used for mapping an address to a name. When the server has received a request from the client, and the server contains the files of only authorized clients. To determine whether the client is on the authorized list or not, it sends a query to the DNS server and ask for mapping an address to the name.

Working of DNS

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