300-360 · Question #83
300-360 Question #83: Real Exam Question with Answer & Explanation
The correct answer is A: Due to the High-Density environment, there was high-utilization of the wireless spectrum. With. In high-density environments, spectrum utilization is the critical differentiator. 802.11b/g uses SISO (single-antenna) transmission with OFDM/DSSS modulation, consuming significantly more airtime per frame compared to 802.11n, which uses MIMO spatial multiplexing and frame aggre
Question
Options
- ADue to the High-Density environment, there was high-utilization of the wireless spectrum. With
- BThe wireless clients were all transmitting at 802.11b data rates and would have operated properly
- CThe clients could not transmit data at the highest mandatory rate of 54 Mbps due to limitations
- DThe wireless controller was denying the client access to the video due to multicast-direct
Explanation
In high-density environments, spectrum utilization is the critical differentiator. 802.11b/g uses SISO (single-antenna) transmission with OFDM/DSSS modulation, consuming significantly more airtime per frame compared to 802.11n, which uses MIMO spatial multiplexing and frame aggregation (A-MPDU/A-MSDU). In a dense environment, 802.11b/g APs saturate the channel quickly, leading to contention, collisions, and retransmissions that degrade real-time video. 802.11n APs handle the same number of clients more efficiently due to higher throughput and airtime efficiency. Choice B is incorrect because 802.11b rates would make things worse, not explain why b/g-only APs have issues. Choice C is incorrect - 54 Mbps is achievable by 802.11g clients. Choice D (WLC denying multicast-direct) is a configuration issue unrelated to the AP standard.
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