Full form: Network Address Translation
Also known as: Network Address Translation
Quick Definition
A technique that translates private IP addresses to public IP addresses for Internet access.
NAT translates IP addresses in packet headers as packets pass through a router. Most commonly, private (RFC 1918) addresses in an internal network are translated to one or more public IP addresses for communication with the Internet. NAT types include: Static NAT (one-to-one mapping), Dynamic NAT (pool of public IPs), and PAT (Port Address Translation / NAT Overload) which maps many private IPs to a single public IP using port numbers.
ip nat inside source static 192.168.1.10 203.0.113.5 ! static NAT ip nat inside source list 1 pool PUBLIC overload ! dynamic PAT
NAT translates source addresses on outbound packets and destination addresses on inbound packets. Remember to configure 'ip nat inside' on internal interfaces and 'ip nat outside' on the external interface.
NAT translates IP addresses in packet headers as packets pass through a router. Most commonly, private (RFC 1918) addresses in an internal network are translated to one or more public IP addresses for communication with the Internet. NAT types include: Static NAT (one-to-one mapping), Dynamic NAT (pool of public IPs), and PAT (Port Address Translation / NAT Overload) which maps many private IPs to a single public IP using port numbers.
NAT translates source addresses on outbound packets and destination addresses on inbound packets. Remember to configure 'ip nat inside' on internal interfaces and 'ip nat outside' on the external interface.
NAT falls under the IP Services domain of the 200-301 exam. Understanding it in context with related terms like pat and acl is essential for answering scenario-based questions correctly.