ITPEC IP April 2019 Question 12
ITPEC IP April 2019 — Question 12 of 100
Bluetooth and IrDA communicate wirelessly and therefore need no physical cable connection. Bluetooth uses short-range radio waves, while IrDA uses infrared light. IEEE 1394 and USB 3.0 are wired interface standards that normally connect devices through physical cables.
Answer (b)
Why not others:
- (a) incorrectly includes the wired IEEE 1394 standard
- (c) also includes IEEE 1394
- (d) incorrectly includes the wired USB 3.0 standard
Key rule: Bluetooth is radio-based and IrDA is infrared-based; IEEE 1394 and standard USB connections are cable-based interfaces.
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