Chapter Summary
Practically all IPv4 networks, and many IPv6 networks, require one or more DHCP servers to automatically assign IP addresses to DHCP clients. Ideally, you would have two DHCP servers per location with DHCP relay servers forwarding requests from subnets that do not have a DHCP server.
DHCP clients attempting to obtain an IP address will be unable to connect to network resources if a DHCP server is not available. Therefore, you should plan to have redundant DHCP servers. The most straightforward way to configure redundant DHCP servers is to configure two different DHCP servers using split-scope, where each is configured to assign addresses for a different portion of the scope.
To allow DHCP servers to reuse IP addresses after clients ...
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