300-430 Question 50
Select 3You are configuring QoS on a Cisco wireless network to ensure that VoIP traffic receives the highest priority from wired to wireless segments. Which of the following actions should you take to correctly implement QoS and maintain consistent traffic priority across the network?
- A
Map DSCP values to the appropriate Wi-Fi Multimedia (WMM) Access Categories.
- B
Ensure that the wired network uses the same DSCP values as the wireless network for traffic classes.
- C
Disable QoS on the wired network to avoid conflicts with the wireless QoS settings.
- D
Configure access points to trust DSCP values received from wired devices.
- E
Set all wireless traffic to the Best Effort (BE) category to simplify QoS configuration.
Show answer and explanation
Correct answers: A, B, D
Explanation
To implement QoS effectively across a Cisco wireless network, it is essential to ensure that DSCP values are mapped to appropriate WMM categories, that wired and wireless networks use consistent QoS policies, and that access points trust the QoS markings from wired devices. These steps allow for end-to-end traffic prioritization and ensure high-quality VoIP performance. Disabling QoS or assigning all traffic to the Best Effort category would undermine QoS implementation.
- A. Correct.
Mapping DSCP values to the correct WMM Access Categories ensures that traffic class priorities are maintained when transitioning from the wired to the wireless network. This is a critical step in implementing QoS.
- B. Correct.
Ensuring consistent DSCP values across wired and wireless networks avoids mismatches in QoS policies and ensures that traffic is classified and prioritized correctly.
- C. Incorrect.
Disabling QoS on the wired network would prevent end-to-end QoS and result in poor traffic prioritization. This action should not be taken.
- D. Correct.
Configuring access points to trust DSCP values from wired devices ensures that QoS markings are preserved when traffic moves from the wired to the wireless network, maintaining priority levels.
- E. Incorrect.
Setting all wireless traffic to the Best Effort (BE) category would negate any QoS benefits and provide no prioritization for VoIP or other high-priority traffic.