Explanation/Reference: Explanation: NPT stands for Network Prefix Translation. IPv6-to-IPv6 Network Prefix Translation (NPTv6) performs a stateless, static translation of one IPv6 prefix to another IPv6 prefix thereby allowing private Unique Local Addresses (ULA) to be able to access the Internet, by translating it to Global Routable Addresses NPTv6 does not do a port translation, hence, the ports remain the same for incoming and outgoing packets.