A firewall administrator is mapping a server's internal IP address to an external IP address for public use. Which of the following is the name of…

Network Address Translation (NAT) is a firewall/router feature that translates a private (RFC 1918) address used on an internal network to a publicly routable address for external communication. A “static” or “one-to-one” NAT rule is commonly used for publishing a server, providing that single internal host with a consistent external IP for public access.

B. VIP – A Virtual IP represents a logical address on load balancers or VRRP groups; it is not the translation mechanism itself.

C. PAT – Port Address Translation maps many internal hosts to one public IP by altering port numbers, not a dedicated one-to-one server mapping.

D. BGP – Border Gateway Protocol exchanges routing information between autonomous systems; it performs no address translation.

1. Cisco Systems

“Cisco ASA Series General Operations CLI

9.x: Translating IP Addresses (Static NAT)

” Section 27.2 – defines NAT as mapping a private host to a single public IP.

2. IETF RFC 2663

“IP Network Address Translator (NAT) Terminology and Considerations

” Sec. 2

pp. 2-3 – describes basic NAT and static one-to-one mappings.

3. Massachusetts Institute of Technology (MIT) 6.829 Computer Networks

Lecture Notes “Network Address Translation

” slides 4-7 – outlines NAT purpose vs. PAT (NAPT).

4. Juniper Networks

“Understanding NAT

” TechLibrary

para. 1 – distinguishes between Source NAT (PAT/NAPT) and Static NAT for server publication.