The A+ Exams Guide: (Exam 220-301), (Exam 220-302) (TestTakers Guides)
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O
Online UPS, 44
Operating systems
A+ Operating System exam objectives, 19–28
fundamentals, 274–276
logical memory, 94
multitasking, 277–278
testing tips, 299–301
version checking, 276–277
Optical mouse, 114
Optical storage devices, 180–182
Optomechanical mouse, 114
Oscillator, 64
OSI reference model, 225–227, 508
OSPF (Open Shortest Path First) protocol, 236
Output, defined, 131. See also I/O devices
Ozone filters, laser printers, 153
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