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Network Address Translation

Chapter Description

Network address translation (NAT) is a function by which IP addresses within a packet are replaced with different IP addresses. This function is most commonly performed by either routers or firewalls. This sample chapter from Cisco Press focuses on NAT within routers.

Looking Ahead

You have seen that NAT aids in a more efficient use of available network addresses. The next chapter, "Introduction to IP Multicast Routing," discusses how multicast routing protocols can make more efficient use of network resources when groups of devices must share common information.

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