COMPTIA A+ Practice Exam

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Prepare for the COMPTIA A+ Exam with essential quizzes covering key topics and multiple choice questions. Boost your knowledge and readiness for achieving certification!

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How many devices can USB support on a single port?

  1. 32 devices

  2. 64 devices

  3. 127 devices

  4. 256 devices

The correct answer is: 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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