What is the difference between static NAT and dynamic NAT?
- Static NAT maps many-to-one, and dynamic NAT maps many-to-many.
- Static NAT maps one-to-one, and dynamic NAT maps one-to-many.
- Static NAT maps one-to-one, and dynamic NAT maps many-to-many.
- Static NAT maps one-to-many, and dynamic NAT maps many-to-one.
Explanation: The primary difference lies in how internal addresses are mapped to external addresses:
- Static NAT performs a one-to-one mapping between a private IPv4 address and a public IPv4 address. This type of translation is permanent and is typically used when an internal device, such as a web server, must be consistently accessible from the outside network using a specific public address.
- Dynamic NAT maps a group of private IPv4 addresses to a group or pool of available public IPv4 addresses, effectively creating a many-to-many mapping. When an internal host needs to communicate externally, the router dynamically selects an unused address from the pool and creates a temporary translation entry.
The other options are incorrect because many-to-one mapping is specifically the characteristic of Port Address Translation (PAT), also known as NAT overloading, which allows multiple hosts to share a single public IP address by using different port numbers.
Related exam: Modules 8 – 13: Checkpoint Exam: Network Routing Answers (CCNP ENCOR v9)
