Network Address Translation NAT Types and Operation
NAT (Network Address Translation) allows multiple devices on a private network to share a single public IP address. It is fundamental to IPv4 address conservation and appears on CCNA, CompTIA Network+, and cloud certifications. Understanding static NAT, dynamic NAT, and PAT (overload) is key to configuring routers and troubleshooting connectivity issues in enterprise environments.
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5 CardsWhat is PAT (NAT Overload)?
What is a NAT translation table?
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What is the difference between static NAT and dynamic NAT?
Static NAT is a fixed one-to-one mapping between a private and public IP — ideal for servers. Dynamic NAT uses a pool of public IPs assigned temporarily.
- Static: predictable, always the same public IP
- Dynamic: flexible, but pool can run out
How does PAT differ from regular NAT?
PAT (Port Address Translation) extends dynamic NAT by using port numbers to allow thousands of devices to share a single public IP simultaneously. Standard dynamic NAT requires one public IP per active session.
Does NAT improve network security?
NAT provides incidental security by hiding internal IP addresses from external networks, making unsolicited inbound connections harder. However, it is not a firewall — dedicated security policies are still needed for proper network protection.