300-430 Question 45
Select 3A network administrator is tasked with configuring QoS on a Cisco wireless network to ensure that voice traffic is prioritized over other types of traffic, such as video and best-effort data. The wireless network consists of multiple SSIDs, and the administrator must ensure the QoS settings are correctly applied at both the SSID and client levels. Which of the following configurations should the administrator implement to achieve this goal?
- A
Enable Wi-Fi Multimedia (WMM) on the SSID and ensure it is set to 'Required'.
- B
Assign voice traffic to the Platinum QoS profile on the wireless LAN controller.
- C
Disable QoS markings on the wired side of the network to prevent conflicts with wireless QoS settings.
- D
Configure QoS Policies to map DSCP values to the appropriate WMM Access Categories (ACs).
- E
Set all traffic on the SSID to Best Effort QoS to ensure equal treatment of all traffic types.
Show answer and explanation
Correct answers: A, B, D
Explanation
To ensure voice traffic is prioritized on a Cisco wireless network, WMM must be enabled and required at the SSID level, and voice traffic should be assigned to the Platinum QoS profile to provide the highest priority. Additionally, QoS Policies must be configured to properly map DSCP values to WMM Access Categories, ensuring consistent traffic prioritization across the network. Disabling QoS markings or treating all traffic equally would lead to poor performance for delay-sensitive applications like voice.
- A. Correct.
Enabling WMM and setting it to 'Required' ensures that clients connecting to the SSID must support WMM, which is essential for prioritizing voice and other time-sensitive traffic.
- B. Correct.
Assigning voice traffic to the Platinum QoS profile ensures that the highest priority is given to voice traffic, which is critical for maintaining call quality.
- C. Incorrect.
Disabling QoS markings on the wired side is not recommended because it can break end-to-end QoS, which is necessary for consistent traffic prioritization across the network.
- D. Correct.
Configuring QoS Policies to map DSCP values to WMM ACs ensures that traffic is correctly classified and prioritized based on its DSCP value.
- E. Incorrect.
Setting all traffic to Best Effort QoS undermines the purpose of QoS, as it does not differentiate or prioritize traffic types, leading to potential voice quality issues.