Cisco
300-365 · Question #8
300-365 Question #8: Real Exam Question with Answer & Explanation
The correct answer is C: Disable data rates that use CCK.. Disabling CCK (legacy 802.11b) data rates forces all transmissions to use faster OFDM encoding, which occupies the channel for shorter durations and significantly reduces overall channel utilization.
Question
A customer has implemented several WLANs in an auditorium utilizing a newly dedicated WLC and is experiencing excessive channel utilization regardless of occupancy. Which action reduces channel utilization without removing SSIDs?
Options
- ADisable MCS data rates 0 through 11.
- BDisable MCS data rates used by 40 MHz channels.
- CDisable data rates that use CCK.
- DDisable VHT data rates.
Explanation
Disabling CCK (legacy 802.11b) data rates forces all transmissions to use faster OFDM encoding, which occupies the channel for shorter durations and significantly reduces overall channel utilization.
Common mistakes.
- A. MCS 0-11 are high-throughput 802.11n rates that use efficient OFDM modulation; disabling them removes faster options and forces traffic to lower rates, which would increase, not decrease, channel utilization.
- B. MCS rates associated with 40 MHz channels are efficient 802.11n/ac rates, and disabling them reduces available bandwidth without targeting the root cause of high utilization from legacy CCK transmissions.
- D. VHT (Very High Throughput) rates are 802.11ac rates that deliver the most efficient airtime usage; disabling them forces capable clients to slower rates and increases channel utilization.
Concept tested. Disabling legacy CCK rates to reduce 802.11 channel utilization
Community Discussion
No community discussion yet for this question.