問題文
A handheld scanner in a school warehouse sleeps between reads. Its user reports that frames are never lost even though the device is asleep when the server replies. How does this work?
選択肢
- The server retransmits the frames after a timeout and the client receives them on the second attempt once it has woken up on schedule.
- The access point lowers its data rate until the client wakes and then sends at the full speed again.
- The access point buffers the frames and announces them in the beacon for the client to collect after waking.
- The client stays awake for every beacon interval and therefore never misses a single frame addressed to it in the warehouse.