Marvin Ellis
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CompTIA A+ Certification All-in-One Exam Guide, Exams 220-1001 & 220-1002, by Mike Meyers

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USB 2.0 is fully backward compatible with USB 1.1 devices, while USB 3.0/3.1 is backward compatible with USB 2.0 devices.
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CompTIA A+ Certification All-in-One Exam Guide, Exams 220-1001 & 220-1002
CompTIA A+ Certification All-in-One Exam Guide, Exams 220-1001 & 220-1002
by Mike Meyers
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