Meaning. — What do you want to eat? — Whatever. — Do you want to sit at the rear or at the front? — I don't mind. What a nonsense. As suggested by RomainVALERI in the comments, n'importe quoi can also be used for pointing out how nonsensical / shameful something is.
N+1 redundancy is a formula to express that every component should have an independent backup that can take over in the event of a failure.