I'm new to networking and trying to understand how CIDR is still relevant with the introduction of NAT. If we have a public/private scheme for routers, how is CIDR still relevant? Is this at an ISP level?
Here's what I know: Classful addressing ended in the mid-90s and that CIDR replaced it. CIDR notation has suffix indicating the number of bits for the host. This allows for the host and network to be broken up differently than with the classful addressing, but I still don't see how this could be compatible in a scheme where NAT (public/private) addressing is used.
If they are different concepts, could someone kindly explain, with a home network for example how they differ?