Cisco
300-365 · Question #51
300-365 Question #51: Real Exam Question with Answer & Explanation
The correct answer is C: 802.11e. VoWLAN phones must support 802.11e and WMM to utilize wireless QoS mechanisms that prioritize voice traffic over other traffic types.
Question
Refer to Exhibit. What two items need to be supported on the VoWLAN phones in order to take full advantage of this WLAN configuration? (Choose two.)
Exhibit
Options
- AAPSD
- B802.11a
- C802.11e
- DWMM
- E802.11r
- FSIFS
Explanation
VoWLAN phones must support 802.11e and WMM to utilize wireless QoS mechanisms that prioritize voice traffic over other traffic types.
Common mistakes.
- A. APSD (Automatic Power Save Delivery) is a power-saving sub-feature within 802.11e/WMM but is not the primary QoS mechanism needed to benefit from voice traffic prioritization.
- B. 802.11a defines the 5 GHz PHY layer standard and has no bearing on QoS capabilities for voice traffic.
- E. 802.11r (Fast BSS Transition) improves roaming handoff speed but is not required to utilize QoS traffic prioritization on the WLAN.
- F. SIFS (Short Inter-Frame Space) is a medium access timing mechanism built into the 802.11 standard and is not a configurable client feature.
Concept tested. VoWLAN QoS requirements - 802.11e and WMM
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