Question: what is amsdu and ampdu?
Answer: The main distinction between MSDU & MPDU is the former corresponds to upper part of MAC sublayer where as MPDU. A-MSDU: The concept of A-MSDU is to allow multiple MSDUs to be sent to the same receiver concatenated in a single MPDU. This supporting function for A-MSDU within 802.11n is mandatory at the receiver.