H12-311_V3.0 · Question #74
MIMO (Multiple input and multiple output), that is, multiple input and multiple output, wireless access points and clients using 802.11n technology can use up to three spatial streams to transmit…
The correct answer is B. False. Option B is correct because 802.11n supports up to four spatial streams, not three. The 600Mbps theoretical maximum is only achievable with all four streams operating simultaneously over a 40MHz channel with a short guard interval; three streams would yield a maximum of…
Question
MIMO (Multiple input and multiple output), that is, multiple input and multiple output, wireless access points and clients using 802.11n technology can use up to three spatial streams to transmit data at the same time, and the theoretical rate can reach up to 600Mbps.
Options
- ATrue
- BFalse
How the community answered
(29 responses)- A24% (7)
- B76% (22)
Explanation
Option B is correct because 802.11n supports up to four spatial streams, not three. The 600Mbps theoretical maximum is only achievable with all four streams operating simultaneously over a 40MHz channel with a short guard interval; three streams would yield a maximum of approximately 450Mbps, not 600Mbps. Option A is wrong because it accepts a statement that conflates two separate facts - the stream count and the peak rate - in a way that is internally inconsistent under the 802.11n specification.
Memory tip: Pair "4 streams" with "600Mbps" - 802.11n needs all four spatial streams to reach its headline speed, so any claim of 600Mbps from only three streams is false.
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