One type of wireless networking that does not use signals in the radio frequency (RF) band of the electromagnetic spectrum is _________, which sends data as a form of rays over relatively short distances.
A. infrared (IR) transmission
B. cellular transmission
C. electromagnetic induction
D. hetero junction bipolar induction
infrared (IR) transmission
Rationale: One type of wireless networking that does not use signals in the RF band of the electromagnetic spectrum is infrared (IR) transmission, which sends data as infrared light rays over relatively short distances. Like an infrared television remote control, infrared technology requires line-of-sight transmission. See 4-4: Networking Media
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