V Name Resolution
Because the 32-bit number is impossible to remember, and the humanized octet number isnt much better, human names are given, such as Microsoft.com. A network function called a name service handles the translation between the human-readable fully qualified domain name (FQDN) like www.microsoft.com and numeric IP address like 220.127.116.11, much as telephone books and Directory Assistance services handle the translation between names and telephone addresses. A fully-qualified domain name is one consisting of both a simple hostname portion, and a domain name portion. For example, in www.microsoft.com, www would be the hostname and Microsoft.com would be the domain name, basically the identifier of which organizations network is involved.
Thanks to TCP/IPs ability to resolve (or map) user friendly names to IP addresses, we dont have to remember the numeric IP addresses of every web site we want to visit. Your computer knows how to look up the IP address of a site when you give it an easier-to-remember name like www.microsoft.com.
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