Discussion
Match the USB transfer type with what it suits.
1. Interrupt 2. Bulk 3. Isochronous
P. Audio streaming Q. A keyboard R. Mass storage
Answer: B
Correct answer: 1-Q, 2-R, 3-P
Each transfer type matches a different requirement. Interrupt transfers poll at a guaranteed interval with a small payload, which suits a keyboard or mouse. Bulk transfers use whatever bandwidth is left and retry until correct, which suits mass storage. Isochronous transfers reserve bandwidth and never retry, which suits audio.
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