Palo Alto Networks Certified Network Security Engineer (PCNSE)Deploy and ConfigureMedium
A network engineer needs to configure a NAT policy on a Palo Alto Networks firewall to allow internal users to access external resources using a single public IP address. This type of NAT allows multiple internal IP addresses to be translated to a single public IP address. Which NAT type should be configured?
- ADynamic IP and Port (DIPP)
- BStatic NAT
- CDynamic IP
- DU-turn NAT
Show answer & explanationAnswer & explanation
Correct answer: A. Dynamic IP and Port (DIPP)
Dynamic IP and Port (DIPP) is the NAT type used to translate multiple internal private IP addresses to a single public IP address using port numbers, commonly known as PAT (Port Address Translation) or NAT Overload.
Why the other options are wrong
- B. Static NAT is a one-to-one mapping of a private IP to a public IP, not suitable for multiple internal users sharing a single public IP.
- C. Dynamic IP maps a private IP to any available IP from a pool of public IPs, but still typically one-to-one at any given time unless combined with port translation.
- D. U-turn NAT (or Hairpin NAT) is used when an internal host needs to access another internal host using its public IP address, not for outbound internet access.
Dynamic IP and Port (DIPP) NAT
A NAT type that translates multiple private IP addresses to a single public IP address by using different source port numbers for each connection, also known as Port Address Translation (PAT).
- Enables many-to-one IP address translation.
- Conserves public IP addresses.
- Commonly used for outbound internet access from internal networks.
- Each internal connection gets a unique public IP:Port combination.
Memory trick: DIPP's the key, for many to be, out to the internet, wild and free!