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Domain Name Services
IP addresses work well for computers - but not for humans.
Enter the concept of a Domain name. Example:
spacelink.msfc.nasa.gov
It is read by the computer from right to left, as follows:
The top domain is gov - government.
The next domain is nasa - NASA.
The next domain is msfc - Marshall Space Flight Center.
The last domain is spacelink - a computer running the spacelink
program, or it could be the computer’s name.
Domain Named Servers communicate domain changes/add/deletes
with each other on a regular basis.