Describe dynamic NAT.

What will be an ideal response?

Dynamic NAT means that the NAT router automatically maps a group of valid local IP addresses to a group of Internet IP addresses, as needed. This means that the network administrator is not concerned about which IP address the internal clients use, just that they can get an address. The network administrator also does not have to spend any time defining specific one-to-one mappings between the private and public IP addresses. Any private IP address will automatically be translated to one of the available Internet IP addresses by the NAT router. Addresses for dynamic NAT are pulled out of a predefined pool of public addresses. The administrator must define the pool and then state which internal private addresses can use the pool.