DNS changes don't propagate. However the results of DNS searches do get
cached. In principle, when you make a request, the request is routed to
the name server for the domain in question, and to get there, requests
may have to be made for higher level name servers, up to the root level.
In practice, requests are normally made through the ISPs caching name
server, so, if someone else has accessed the name recently, the query
will be satisfied from there. That means that very few requests ever
get sent to the root level servers, but the .COM ones may still be quite
busy.
DNS entries have a lifetime associated with them, and cached entries
which are older than that lifetime are ignored, and the request
forwarded towards the definitive server.
A competent system administrator will reduce the lifetime down to
minutes, a day or two before making any planned change, so that the
change will take effect very quickly.
--
David Woolley
Registered owner K2 06123
On 29/12/13 03:47, Fred Jensen wrote:
The link on your desktop is simply a URL. All that works in the
Internet are IP addresses. There is a translation between URL's and
real IP addresses, it happens in the Domain Name Servers around the
world. An update used to come out once a day, don't know now, but the
DNS talk to each other and the update propagates around the world.
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