how to configure DHCP Server on Ubuntu Server 20.04

Assign Static IP Address on Ubuntu 20.04 LTS and Configure DHCP:

step1: check if /etc/cloud/cloud.cfg.d/subiquity-disable-cloudinit-networking.cfg is disable. like this :network: {config: disabled}
step2:check name: ip add show and install : sudo apt-get install isc-dhcp-server &sudo nano /etc/dhcp/dhcpd.conf
put this code:
subnet 172.16.1.0 netmask 255.255.255.0 {
range 172.16.1.80 192.16.1.90;
option routers 172.16.1.1;
option domain-name-servers 172.16.1.2, 172.16.1.3;
option domain-name “example.com”;
}
step3: nano /etc/netplan/00-installer-config.yaml
step4: add this code:
network:
ethernets:
enp0s3:
addresses: [172.16.1.3/24]
gateway4: 172.168.1.1
nameservers:
addresses: [4.2.2.2, 8.8.8.8]
version: 2

to reserve an ip:
host Server1 {
hardware ethernet 00:00:00:20:c0:a5;
fixed-address 172.16.1.88;
}
step5:sudo netplan apply& sudo isc-dhcp-server restart .