Which of the following is used to notify all stations about a multicast or broadcast frame waiting to be transmitted?
  1. DTIM
  2. CTIM
  3. ATIM
  4. BTIM
Explanation
Answer - A - DTIM is used to notify all stations about a multicast or broadcast frame waiting to be transmitted.

Key Takeaway: DTIM, or Delivery Traffic Indication Message, is used to notify stations of pending broadcast traffic. It is a kind of Traffic Indication Message which informs the clients about the presence of buffered multicast/broadcast data on the access point. It is generated within the periodic beacon at a frequency specified by the DTIM Interval.
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