Implementing and Operating Cisco Enterprise Network Core Technologies (ENCOR) v1.2InfrastructureEasy
A network administrator is configuring a new Cisco router and needs to ensure that all internal hosts can access the internet using a single public IP address. Which NAT configuration type should be implemented?
- ANAT Overload (PAT)
- BPolicy NAT
- CDynamic NAT
- DStatic NAT
Show answer & explanationAnswer & explanation
Correct answer: A. NAT Overload (PAT)
NAT Overload, also known as Port Address Translation (PAT), allows multiple private IP addresses to be translated to a single public IP address by using different port numbers. This is the most common method for enabling internet access for an entire internal network with a limited number of public IP addresses.
Why the other options are wrong
- B. Policy NAT applies NAT based on specific policies, but doesn't inherently describe the one-to-many translation needed here.
- C. Dynamic NAT maps multiple private IP addresses to a pool of public IP addresses, but typically requires more than one public IP.
- D. Static NAT maps a single private IP address to a single public IP address, which doesn't meet the requirement of multiple hosts using one public IP.
NAT Overload (PAT)
A type of Network Address Translation (NAT) that maps multiple private IP addresses to a single public IP address by using different port numbers for each connection.
- Also known as Port Address Translation (PAT).
- Allows many-to-one IP address translation.
- Uses port numbers to distinguish between internal hosts.
- Most common NAT type for internet access.
Memory trick: Network Address Translation: Many options for getting out.