|BASIS OF COMPARISON
|NAT translates the private local IP to the global public IP address.
|PAT translates the private IP addresses of an internal network to the public IP address with the help of port numbers.
|NAT has a one-to-one or many-to-one relationship.
|PAT has a many-to-one relationship.
|There are two types of NAT: Static NAT and Dynamic NAT
|There are two types of PAT: static and overloaded PAT.
|NAT along with the IPv4 addressing scheme preserves IPv4 addresses and extends their lifespan.
|PAT uses the IPv4 address along with the port number.
|NAT is the superset of PAT.
|PAT is a form of dynamic NAT.
|NAT improves security because the IP addresses of the internal hosts are invisible.
|In PAT, the private address prevents the public address from being exposed.
|NAT uses no ports in the translation process.
|PAT uses source ports in the translation process.