Ace the COMPTIA A+ 2025 Exam – Get Ready to Geek Out and Dominate!

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Question: 1 / 525

How many devices can USB support on a single port?

32 devices

64 devices

127 devices

The USB standard can support up to 127 devices on a single port. This is because USB 2.0 and earlier versions use a 7-bit addressing system, allowing for a maximum of 127 unique addresses (2^7 = 128). However, one of these addresses is reserved for the host computer, leaving 127 available for connected devices. Options A, B, and D are all numbers that exceed the maximum number of supported devices and are therefore incorrect.

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256 devices

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