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DNS Cache and your
ISP: Every time you access a site from your ISP, they cache the URL, as well as its associated IP number. If their network is properly setup, these DNS cache records should "Expire" at least every 24-hours. If they did not (which is often the case), you'll experience this: You enter your http://www.mydomain.com/ URL, and it keeps
taking you back to your old server account. Unfortunately, this adds additional confusion to their
clients, and especially the ones whom are trying to point their domain name
to a new server. When we say the Internet, we mean the numerous intermediate "points of access" you're routed through before reaching your final destination. For the most part, these intermediate points of access consist of "Internet Routers" and "Internet Caching Engines." These too, maintain their own DNS cache, which assists them in routing traffic/resolving URL's to the correct destination IP's. Don't worry though, as Internet routers are usually faster
at clearing their DNS cache than ISP's are. The first thing that happens is the "World Root Name Servers" will check all of the various "Domain Registers for updates. Ok, so now the Root Name Servers have done their job. The rest of it is up to the many ISP providers who "should be" updating their DNS records (at least every 24 hours), but a number of them will not.
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