Many operating systems allow you to specify several DNS servers in their configurations. When this capability is provided, a priority order is also provided so that a preferred server can be identified. For a given DNS query, the system attempts to get DNS information from the first IP address in the list. If no response is received, it goes to the next server in the list, and so on.
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In most systems, if you have two DNS servers listed, the system only checks the second server if no response is received from the first server. If the system attempts to check a host name with the first server and receives a message that the host name is not recognized, the system does not try the second DNS server. |
