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IT Interview Questions: What is the real difference between NAT and PAT?
Information Technology (IT) Interview Questions and Answers
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IT Interview Questions: What is the real difference between NAT and PAT?
Port Address Translation (PAT) is a special kind of Network Address Translation (NAT). It can provide an excellent solution for a company that has multiple systems that need to access the Internet but that has only a few public IP addresses. Let's take a look at the distinctions between NAT and PAT and see how they are typically used. Then, I'll show you how to configure PAT on a Cisco router.
Understanding PAT and NAT Before discussing PAT, it will help to describe what NAT does in general. NAT was designed to be a solution to the lack of public IP addresses available on the Internet. The basic concept of NAT is that it allows inside/internal hosts to use the private address spaces (10/8, 172.16/12, and 192.168/16 networks see RFC1918), go through the internal interface of a router running NAT, and then have the internal addresses translated to the router's public IP address on the external interface that connects to the Internet.
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