I encountered a a CCNA question referrring to the following scenario:
An organization has one router that is its border with the outside world. The gateway router is connected to three internal routers. Only the internal routers have feeds to hosts.
NAT needs to be implemented and all the hosts need to be put into a private address space.
The question is whether one should implement NAT on the gateway router, or implement NAT once on each interior router.
I thought the ease of centralized administration would make the single router approach the best.
What is the "correct" answer?