NAT (Network Address Translation)
NAT translates IP addresses between networks, often private-to-public.
Updated: 2026-03-05
Definition
NAT changes source or destination IP addresses as traffic passes a device (typically a router/firewall).
It is commonly used to let private IP networks access the internet using public addresses.
Key points
- SNAT changes source; DNAT changes destination
- PAT (overload) maps many private hosts to one public IP using ports
- NAT is not a security control by itself
Common mistakes
- Thinking NAT equals firewall (it’s different).
- Breaking inbound connectivity without correct DNAT/port-forward rules.
Related exams
Related terms
Want to practice this in exam-style questions?
Use the mini tests on each exam page, then continue in the app for offline packs and detailed explanations.
Go to exams