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To fix this problem the concept of Primary and Secondary Name Servers (many systems allow tertiary or more Name Servers) was born.
If the Primary Name Server does not respond a host can use the Secondary (or tertiary etc.).
Resources can be added, moved, changed or deleted at a single location - the Name Server.
At a stroke network management was simplified and made more dynamic.
If you're waiting on DNS scavenging, there's no fast way to do it.# In the case of the g TLDs, such as .com, etc., the user part of the delegated name - the name the user registered - is a Second Level Domain (SLD). The user part is therefore frequently simply referred to as the SLD.So the the Domain Name in the example above can be re-defined to consist of: The term Second Level Domain (SLD) provides technical precision but can be confusing when applied to a generic concept like a user domain - unless the precision is required we will continue to use the generic term Domain Name or simply Domain to describe the whole name, for instance, what this guide calls a Domain Name would be or uk.As our network grows we start to build up a serious number of Names in our Name Server (database). Which leads us nicely into the characteristics of the Internet's Domain Name System (DNS).The Internet's Domain Name Service (DNS) is just a specific implementation of the Name Server concept optimized for the prevailing conditions on the Internet.
A DNS (Domain Name Service) acts like a phonebook, keeping a log of domain names, then turning them into an IP address.