Network address translation is a primary reason that IPv4 addressing has survived and is still in use today. When you masquerade the origin of a computer’s IPv4 address on a network it is known as a NAT firewall.
This allows the sending computer’s message to appear as if it is coming from another computer’s address. When NAT is implemented it allows a router to translate the source IPv4 address in the packet header as it crosses the router, changing the source address in the packet from one address to another.
NAT basics, also known as network address translation is an important part of the CCENT and CCNA certification exams.
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