INTRODUCTION TO DNS (DOMAIN NAME SYSTEM)
Domain name system is a distributed client-server system for resolving hostnames. This is implemented as an Application layer level protocol in TCP/IP networks. This system provides a distributed database of hostname to–IP address mapping. Each host on the global network is supposed to be part of a domain. A domain is thus defined as a combination of hosts sharing a common rightmost part in their name. A domain is a completely logical structure of hosts and has nothing to do with where the hosts are physically located. These hosts may be present on one network or several networks. Usually those hosts are included in one domain managed by a common administrative authority. This administrative authority ...
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