Explain the lease process of the DHCP server.

The Process for leasing the ip address in DHCP is called DORA( D-Discover, O-Offer, R-Request, A- Acknowledge).

DHCP Server leases the IP addresses to the clients as follows:
DORA
D (Discover) : DHCP Client sends a broadcast packets to identify the dhcp server, this packet will contain the source MAC.
O (Offer) : Once the packet is received by the DHCP server, the server will send the packet containing Source IP and Source MAC.
R (Request) : Client will now contact the DHCP server directly and request for the IP address.
A (Acknowledge) : DHCP server will send an ack packet which contains the IP address.