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CCNA Quick Reference Sheets (CCNA Exam 640-802) by Jim Doherty, Eric Rivard

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Chapter 8. Managing Address Space with NAT and IPv6

Network Address Translation (NAT) was initially developed as an answer to the diminishing number of IP addresses. When the IP address scheme was originally developed, it was believed that the address space would not run out. The combination of the PC explosion and the emergence of other network-ready devices quickly consumed many of the available addresses.

An additional (and equally important) benefit of NAT is that it hides private addresses from public networks, making communication more secure from hackers. Figure 8-1 shows how NAT translates the inside address of 10.0.0.1 to the outside address 172.2.34.21. Properties of NAT are as follows:

  • NAT is configured on a router, firewall, or other ...

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