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At this point, the client attempts to renew its current lease with any available DHCP server.
In addition to IP addresses, a scope can also assign optional parameters to DHCP clients, including the IP address of DNS servers, WINS servers, and routers, and so on.
The lease duration can be customized to meet the requirements of your network.
For example, if the number of IP addresses exceeds the number of DHCP clients on the network, you can configure a longer lease duration.
To accomplish this, use the 80/20 rule, in which 80 percent of the IP addresses for one subnet are added to a scope on one DHCP server and the remaining 20 percent are added to a scope on another DHCP server.
Because both servers have IP addresses available for the subnet, clients (or some of them) can still obtain an IP address should one of the servers become unavailable.
Note Each DHCP server requires at least one active scope to function on a network.