Answers:
A type of NAT in which a private IP address is mapped to a public
IP address drawing from a pool of registered (public) IP addresses. Typically,
the NAT router in a network will keep a table of registered IP addresses, and
when a private IP address requests access to the Internet, the router chooses
an IP address from the table that is not at the time being used by another
private IP address. Dynamic NAT helps to secure a network as it masks the
internal configuration of a private network and makes it difficult for someone
outside the network to monitor individual usage patterns.