HPE6-A47 Exam Dumps : Designing Aruba Solutions

Jitter is the variation in the delay of packets arriving at the destination. It is caused by network congestion, routing changes, or other factors that affect the transmission quality. Jitter can affect the quality of VoIP calls, as it can cause gaps, distortion, or echo in the audio. According to the Aruba Validated Reference Design for Voice and Video over Wi-Fi, the recommended maximum jitter for VoIP calls is 30 ms. Therefore, a jitter of 100 ms would typically cause a poor experience for users.

The other options are incorrect because:

• A. The packet loss is the percentage of packets that are lost or discarded during transmission. Packet loss can affect the quality of VoIP calls, as it can cause missing or corrupted audio. However, according to the Aruba Validated Reference Design for Voice and Video over Wi-Fi, the recommended maximum packet loss for VoIP calls is 1 percent. Therefore, a packet loss of 0.3 percent would not typically cause a poor experience for users.
• B. The throughput is the amount of data that can be transferred per unit of time. Throughput can affect the quality of VoIP calls, as it determines the bandwidth available for the audio. However, according to the Aruba Validated Reference Design for Voice and Video over Wi-Fi, the typical throughput for VoIP calls is 64 Kbps. Therefore, a throughput of 67 Kbps would not typically cause a poor experience for users.
• C. The latency is the delay between the sender and the receiver of packets. Latency can affect the quality of VoIP calls, as it can cause delays or out-of-sync audio. However, according to the Aruba Validated Reference Design for Voice and Video over Wi-Fi, the recommended maximum latency for VoIP calls is 150 ms. Therefore, a latency of 100 ms would not typically cause a poor experience for users.

References:

• Aruba Validated Reference Design: Voice and Video over Wi-Fi - Chapter 2)
• Aruba Certified Design Professional Official Certification Study Guide (HPE6-A47) - Chapter 7)

 Aruba Instant APs are a simple, easy to deploy, and cost-effective solution for small office buildings that need wireless access. Aruba Instant APs can form a self-organizing and self-healing mesh network that supports basic rogue AP detection and provides a stateful firewall with role-based policies. Aruba Instant APs do not require a separate controller or license, and can be managed from the cloud or a mobile app. Aruba remote APs are designed for branch or home offices that need to connect to a central controller over a WAN link. Aruba campus APs and a Virtual Mobility Controller are suitable for larger or more complex deployments that need more scalability and flexibility. Aruba campus APs and an Aruba 7005 Mobility Controller are also more expensive and require additional hardware and licensing. References: Aruba Instant Access Points), Aruba Validated Design: Campus Wireless LAN)

The specifications for the AP models are in the format of Tx:Rx:SU-MIMO:MU-MIMO:MU-MIMO clients, where Tx is the number of transmit antennas, Rx is the number of receive antennas, SU-MIMO is the number of spatial streams supported in single-user MIMO mode, MU-MIMO is the number of spatial streams supported in multi-user MIMO mode, and MU-MIMO clients is the number of MU-MIMO clients that can be served simultaneously.

The customer requirements are:

• Support for MU-MIMO: This means the AP must have a MU-MIMO value greater than 1, as MU-MIMO is a technique that allows multiple spatial streams to be transmitted to different clients at the same time.
• Support for up to four spatial streams, both when MU-MIMO is used and when it is not used: This means the AP must have a SU-MIMO value and a MU-MIMO value of 4, as spatial streams are independent data streams that can be transmitted or received by an antenna.
• Support for transmissions to up to three MU-MIMO clients at the same time: This means the AP must have a MU-MIMO clients value of 3, as this indicates the maximum number of clients that can receive MU-MIMO transmissions from the AP at the same time.

Based on these criteria, only the AP 335 meets the customer requirements, as it has a specification of 4x4:4:4:4:3, which means it has 4 transmit and receive antennas, 4 spatial streams in both SU-MIMO and MU-MIMO modes, and can serve 3 MU-MIMO clients simultaneously. The AP 325 does not meet the customer requirements, as it has a specification of 4x4:4:4:3:3, which means it has only 3 spatial streams in MU-MIMO mode, and can only serve 2 MU-MIMO clients simultaneously.

References:

• Aruba AP-335 Wireless Access Point | Aruba
• Aruba AP-325 Wireless Access Point | Aruba
• Multi-User MIMO in WiFi 6 - Arista Networks