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How effective is CSMA/CA for WLAN and when do collisions still happen?

        I understand why CSMA/CA in WLAN is required over CSMA/CD from <a href="https://networkengineering.stackexchange.com/questions/10715/why-does-wlan-use-collision-avoidance-and-not-collison-detection">this post here</a> and was left with the question how effective CSMA/CA is.
So I was wondering if there still might be collisions at all. I assume that it can't prevent 100% of all possible collisions but I am not sure when they do happen. What I am guessing:
  • Collisions happen when two or several senders are recognizing a channel as idle around the same time and will start sending.
Is this right and might there be any other reasons as well?

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