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NEW QUESTION # 37
An ACME company employee complained about a recent poor-quality VoIP call while moving around their office environment HPE Aruba Networking Central reported a fair UCC score for this call while your VoIP engineer reported that their systems reported a MOS of 2, 3. The VoIP devices are operating over the 5GHz frequency band.
What are the possible contributing factors? (Select two.)
Answer: D,E
Explanation:
VoIP quality can be negatively impacted by insufficient cell overlap in AP deployment plans, which can cause poor handoffs between APs as a user moves around. This results in a degraded VoIP experience.
Additionally, roaming into an area with continuous Zigbee operation can cause interference with the 5GHz frequency band, further contributing to poor VoIP call quality. The Zigbee communication protocol operates on the same frequency band as Wi-Fi and can introduce noise and interference, which leads to a reduced MOS score, as reported by the VoIP engineer.
NEW QUESTION # 38
Refer to the exhibit.
You have recently implemented a VoWiFi solution with QoS, but users are experiencing poor call quality during busy periods. Based on the output generated after some test calls, what change should you make to
improve call quality?
Answer: D
Explanation:
The command output shows WMM transmit counters per access category on the AP:
* Tx WMM [BK] 56
* Tx WMM [BE] 35
* Tx WMM [VI] 200093
* Tx WMM [VO] 0
* Drops: BE Dropped 566, VO Dropped 3
In Aruba WLAN QoS, traffic is queued using WMM access categories mapped from 802.1p/DSCP/UP values:
* AC_VO (Voice) is for latency-sensitive voice; it should carry EF/DSCP 46 and UP 6.
* AC_VI (Video) is for video; it should not carry voice traffic.
The statistics show zero traffic in AC_VO and a very large amount in AC_VI during the test calls. This indicates that voice frames are being mapped to the Video access category instead of Voice, which reduces priority and increases contention-consistent with poor call quality during busy periods.
HPE Aruba documentation states:
* "Voice traffic (EF/46, UP 6) must be mapped to WMM Voice (AC_VO) to receive the highest priority."
* "Incorrect DSCP/UP-to-WMM mapping results in voice frames using lower-priority queues (e.g., AC_VI) and degraded call quality." Therefore, the corrective action is to reconfigure DSCP/UP-to-WMM mapping so that DSCP 46 (EF) maps to UP 6 # AC_VO on the SSID/user-role, ensuring voice traffic uses the proper Voice queue.
Why others are incorrect:
* B. enable WMM for the SSID - WMM is already active (WMM counters are present).
* C. disable AirSlice - Not indicated; issue is misclassification, not airtime reservation.
* D. update ACLs - ACLs don't fix QoS category mapping for voice marking.
References (HPE Aruba official guides):
* Aruba WLAN QoS/Traffic Management: DSCP/UP to WMM access category mappings and recommended settings for VoWiFi (EF 46 # AC_VO).
* Aruba Mobility and AOS 10 QoS configuration: user-role/SSID QoS mapping behavior and WMM queue operation.
NEW QUESTION # 39
An existing AOS-10 wireless deployment is expanding its zero-trust wireless network to multiple locations.
The requirement is to propagate role information to enforce group-based policies for wireless client traffic across all locations.
To achieve this goal, which must be configured in this infrastructure?
Answer: C
Explanation:
Comprehensive and Detailed Explanation From Exact Extract of HPE Aruba Networking Switching:
In AOS-10 deployments using Zero Trust network architecture, user and device identities are enforced through roles assigned by ClearPass or Aruba Central policies. For multi-site environments, maintaining consistent policy enforcement requires role propagation between gateways across different locations.
To propagate user roles and policies across sites, tunneled SSIDs with gateways are required. This design ensures that wireless client traffic is tunneled from the access point (AP) to the Aruba gateway, where role- based access control (RBAC) and policy enforcement occur. The gateway acts as the policy enforcement point (PEP) for both local and remote traffic.
Exact Extract from HPE Aruba Networking AOS-10 and Switching Documentation:
"In AOS 10, tunneled SSIDs are used to extend centralized policy enforcement to gateways. Gateways apply user roles, firewall policies, and dynamic segmentation consistently across distributed sites."
"For zero-trust designs requiring cross-site role propagation, all wireless traffic must terminate on gateways through tunneled SSIDs. Gateways then synchronize role information through the overlay tunnel or mobility framework." Thus, the only way to propagate role information between multiple sites in a zero-trust deployment is through tunneled SSIDs that terminate at the Aruba gateways. This ensures consistent policy enforcement across locations.
Why the Other Options Are Incorrect:
* A. Configure the gateways to mobility type and configure the Roles under System # Client Roles in Central:While mobility type configuration is used for roaming, it does not enable role propagation across sites. Roles must be tied to tunneled SSIDs terminating on gateways for centralized enforcement.
"Gateway mobility enables seamless roaming, not centralized role propagation."
* B. Configure "use switch fabric for role propagation" under Security # Client Roles:This option applies to AOS-CX switch fabrics (Campus Fabric design) and not wireless AOS-10 environments.
Wireless role propagation uses gateway tunnels, not switch fabric propagation.
"Use switch fabric for role propagation applies to CX switch-based VXLAN fabrics, not wireless gateway deployments."
* C. Overlay campus switch fabric with CX switches:While Aruba CX fabrics can propagate roles in wired environments, this does not fulfill the requirement for wireless role propagation between remote sites.
"Role propagation over CX fabric applies to wired clients and does not substitute for tunneled SSID gateways in wireless networks." References of HPE Aruba Networking Switching Documents or Study Guide:
* Aruba AOS 10 Network Design Guide - "Zero-Trust Design and Role Propagation in Multi-Site Deployments."
* Aruba Campus Wireless and Gateway Deployment Guide - "Tunneled SSIDs and Centralized Role Enforcement."
* Aruba Policy Enforcement and Role-Based Access Control Guide - "Role propagation over gateway tunnels."
NEW QUESTION # 40
You configured a tunneled SSID with captive portal and a ClearPass Guest Self Registration workflow when testing and launching the self-registration workflow, after successful registration, the login action shows the following error:
What is the best solution to resolve this error?
Answer: C
Explanation:
Including the root and intermediate certificates in the captive portal certificate for the gateway will resolve the error seen during the login action after successful registration. This is necessary to ensure the SSL/TLS handshake can be completed successfully, as the client browser needs to validate the entire certificate chain.
NEW QUESTION # 41
An ACME company employee complained about a recent poor-quality VoIP call while moving around their office environment. HPE Aruba Networking Central reported a fair UCC score for this call while your VoIP engineer reported that their systems reported a MOS of 2.3. The VoIP devices are operating over the 5GHz frequency band.
What are the possible contributing factors? (Select two)
Answer: A,C
Explanation:
Comprehensive and Detailed Explanation From Exact Extract of HPE Aruba Networking Switching:
Reference: Aruba WLAN Validated Reference Design - Voice over WLAN Considerations; Aruba Central UCC visibility guidelines; AOS-S/CX Campus Wired/Wireless Design Guides (Roaming and RF Design sections).
Channel support limitations on 5 GHz (D): Aruba guidance emphasizes enabling and using DFS spectrum (U-NII-2/U-NII-2e) for capacity and better roaming. Clients that do not support these channels see fewer candidate APs, which increases contention on the remaining non-DFS channels and can lead to sticky roaming and packet loss during movement-resulting in poor MOS even if the Central UCC score shows only
"fair."Exact extract: "Client devices that lack DFS (U-NII-2/Extended) support are restricted to a reduced channel set. This limits roam candidates and concentrates airtime utilization, which can degrade real-time applications, including voice, during mobility."Reference: Aruba RF Planning and Optimization Guide (5- GHz channelization and DFS usage); Aruba Validated Design for High-Density and Real-Time Applications (Client capabilities and roaming).
Why the other options are not the best contributors:
B (CAC level set too low): Aruba's CAC controls voice call admission based on airtime reservations. If CAC is set too low, calls are prevented from starting rather than allowed to start and then suffer in-call quality issues while roaming.Exact extract: "Call Admission Control rejects new calls when available airtime for voice is insufficient; it does not intentionally degrade admitted calls."Reference: Aruba Voice and UCC Best Practices (CAC behavior).
C (BSS coloring not enabled): BSS Coloring (802.11ax) can improve spatial reuse in dense deployments, but its absence is not a primary cause of a sudden MOS of ~2.3 during roaming. Aruba documents position it as an optimization, not a prerequisite for acceptable voice quality.Exact extract: "BSS Coloring enhances efficiency in overlapping BSS scenarios; it is an optimization feature and not required for baseline voice operation."Reference: Aruba 802.11ax (Wi-Fi 6/6E) Feature Overview - OBSS and BSS Coloring.
NEW QUESTION # 42
......
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