CCNP Routing and Switching ROUTE 300-101 Official Cert Guide

NAT

Lesson 2: NAT

While IP addresses are routable through the public Internet, other IP addresses (as defined by RFC 1918) are considered private and are intended for use within an organization. Network Address Translation (NAT) allows private IP addresses to be translated into Internet-routable IP addresses (that is, public IP addresses). This section examines the operation of basic NAT and a variant called Port Address Translation (PAT). Then, this section reviews a collection of NAT design considerations and a fairly recent enhancement to NAT configuration, called NAT Virtual Interface (NVI).