Discussion
How many peripheral devices can be connected using USB port ?
Answer: C
A USB port can connect up to 127 peripheral devices.
USB uses a 7-bit device address, which gives 27 = 128 addresses. Address 0 is reserved for a device that has just been connected and not yet configured, which leaves 127 addresses for devices, connected through a tree of hubs.
12 is the full-speed data rate of USB 1.1 in Mbit/s, which is a common distractor, and 17 and 172 do not correspond to any USB limit.
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