1. DHCP Request (DHCPREQUEST)
The client sends a DHCPREQUEST message directly to the DHCPv4 server that originally offered the IPv4 address
2. DHCP Acknowledgment (DHCPACK)
On receiving the DHCPREQUEST message, the server verifies the lease information by returning a DHCPACK
Note: These messages (primarily the DHCPOFFER and DHCPACK) can be sent as unicast or broadcast according to IETF RFC 2131.
Prior to lease expiration, the client begins a two-step process to renew the lease with the DHCPv4 server