11.1 NAT Operation (CCNA 2: Chapter 11: NAT)
Chapter 11: Overview
All public IPv4 addresses that transverse the Internet must be registered with a Regional Internet Registry (RIR). However, with a theoretical maximum of 4.3 billion addresses, IPv4 address space is severely limited.
With the proliferation of personal computing and the advent of the World Wide Web, it soon became obvious that 4.3 billion IPv4 addresses would not be enough.
The long term solution was IPv6, but more immediate solutions to address exhaustion were required.
For the short term, several solutions were implemented by the IETF, including Network Address Translation (NAT) and RFC 1918, Address Allocation for Private Internets.
How NAT, combined with the use of private address space, is used to both conserve and more efficiently use IPv4 addresses to provide networks of all sizes access to the Internet.
NAT characteristics, terminology, and general operations.
Three different types of NAT are static NAT, dynamic NAT, and NAT with overloading.
The benefits and disadvantages of NAT.
The configuration, verification, and analysis of static NAT, dynamic NAT, and NAT with overloading.
How port forwarding can be used to access an internal devices from the Internet.
Troubleshooting NAT using show and debug commands.
How NAT for IPv6 is used to translate between IPv6 addresses and IPv4 addresses.
11.1 NAT Operation
Describe NAT characteristics.
Describe the benefits and drawbacks of NAT.