Questions about DCF.

Hi,

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So I have a general understanding on DCF, mostly from the book 802.11 Wireless Networks the definitive guide. I have a couple questions though, I've looked them up on the internet but couldn't find anything.

1. What are the differences DCF got in 5Ghz and 2.4Ghz networks.
2. What are the differences DCF got in 802.11ac and 802.11n networks.

Please note that I am not asking anyone to explain the two above. Any sources leading to anything related to what I'm looking for is appreciated. That said, I'll also appreciate an explanation, there's no discrimination. (Had to clarify the last bit).

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Thanks,