What Does NAT Mean in 200-301? — Definition & Guide

Full Definition

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.

CLI Command

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

Exam Trap — Don't Get Fooled

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.

Related 200-301 Terms

PAT

A NAT variant that maps multiple private IP addresses to a single public IP using different port numbers.

ACL

An ordered list of permit/deny rules applied to a router interface to filter network traffic.

Frequently Asked Questions

What does NAT mean on the 200-301 exam?

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.

How does NAT appear as a trap on the 200-301?

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.

How important is NAT on the 200-301 exam?

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.