All-mountain versus a cross-country mountain bike?

Can someone clarify the difference between these two types of mountain bikes? I was told that a cross-country bike with a full suspension is the same as all-mountain. I'm assuming all-mountain means it can handle hard trails and a bit of downhill. Can a cross-country with full suspension do the same? I... show more Can someone clarify the difference between these two types of mountain bikes? I was told that a cross-country bike with a full suspension is the same as all-mountain.

I'm assuming all-mountain means it can handle hard trails and a bit of downhill. Can a cross-country with full suspension do the same?

I need a bike that can handle long rides on flat trails as well as moderately advanced tough mountain trails.

Thanks!
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