What does a DNS server do?

Each name requested from a DNS server consists of different parts: One part consists of the actual name of the host or service to be reached, another part identifies the domain. Within a local network, specifying the domain is optional. Examples of these names would be "www.domain.com" or "ftp.domain.com".

Without a DNS server in the local network, every name that is not known locally would be searched for on the default route. By using a DNS server, any name that has a known IP address can be found directly at the correct peer. In principle, the DNS server can be a separate computer in the network. However, the DNS server is best located directly in the device for the following reasons:

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