There are many forms of NAT. Static NAT maps an unregistered IP address to a registered IP address on a one-to-one basis; Dynamic NAT maps an unregistered IP address to a registered IP address from a group of registered IP addresses; Overloading maps multiple unregistered IP addresses to a single registered IP address by using different ports; Overlapping happens when
a device on one network is assigned an IP address on the same subnet as another device on the internet or external network.