300-360 · Question #83
A customer is having issues streaming video over wireless in a few high-density areas of their campus. After further investigation, the administrator has singled out the issue pertains to the…
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…
Question
A customer is having issues streaming video over wireless in a few high-density areas of their campus. After further investigation, the administrator has singled out the issue pertains to the clients associated to 802.11b/g only access points. The rest of the campus is covered in 802.11n access points. What is a possible reason for the issue with video streaming on the 802.11b/g access points as opposed to the 802.11n access points?
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
How the community answered
(38 responses)- A76% (29)
- B3% (1)
- C13% (5)
- D8% (3)
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.
Topics
Community Discussion
No community discussion yet for this question.