300-425 · Question #88
Why is 802.11a connectivity reduced in an X-ray room?
The correct answer is B. X-ray rooms exhibit increased signal attenuation. X-ray rooms are shielded with dense materials such as lead that heavily attenuate RF signals, reducing 802.11a wireless connectivity.
Question
Why is 802.11a connectivity reduced in an X-ray room?
Options
- AX-rays impact the 802.11a UNll-2 channels Vial cause access points to dynamically change
- BX-ray rooms exhibit increased signal attenuation
- CX-rays within these rooms cause multipath issues.
- DX-rays create significant non-Wi-Fi interference on the 802.11a band
How the community answered
(39 responses)- B92% (36)
- C3% (1)
- D5% (2)
Why each option
X-ray rooms are shielded with dense materials such as lead that heavily attenuate RF signals, reducing 802.11a wireless connectivity.
DFS channel changes on UNII-2 are triggered by radar pulse detection, not by X-ray equipment, which operates in a completely different part of the electromagnetic spectrum.
X-ray rooms are constructed with lead-lined walls and dense concrete to contain ionizing radiation. These high-density shielding materials act as significant barriers to 5 GHz RF signals used by 802.11a. The resulting signal attenuation degrades or eliminates wireless connectivity inside and through the walls of these rooms.
Multipath is caused by RF signal reflections off surfaces in the environment; X-ray equipment operation does not directly introduce Wi-Fi multipath propagation.
X-ray machines do not emit energy in the 5 GHz ISM or UNII bands and therefore do not create non-Wi-Fi RF interference on the 802.11a spectrum.
Concept tested: RF signal attenuation from building shielding materials
Source: https://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Mobility/RFabsorb.html
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