Which of the following 802.11/wireless operating modes can operate without an access point?
  1. Infrastructure point
  2. There is no such mode where an access point is not required.
  3. Access less mode
  4. Ad-hoc mode
Explanation
Answer: D - Ad-hoc mode is a peer-to-peer network without the need for an access point.

Key Takeaway: Ad-hoc mode is a method for wireless devices to communicate directly with each other. Operating in ad-hoc mode allows all wireless devices within range of each other to discover and communicate in peer-to-peer fashion. Infrastructure mode needs a centralized access point and it acts more like a client/server network.
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