HPE6-A47 Exam Dumps : Designing Aruba Solutions

 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)

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)

This answer is correct because it matches the scenario for which the Aruba backplane stacking technology is designed. Aruba backplane stacking technology allows up to 10 switches to be interconnected using high-speed backplane cables, creating a single logical device with a single IP address and configuration. This simplifies the management and operation of the network, as well as the redundancy design, as the stack can operate in ring or chain topology and provide fast failover in case of link or switch failure. This technology is suitable for customers who need to deploy a pair of aggregation switches in the same closet, as it reduces the number of devices and links to manage, and provides high availability and scalability for the network.

The other options are incorrect because:

• B. The customer needs to simplify the deployment of core switches which are located in different closets for redundancy purposes. This scenario is not suitable for Aruba backplane stacking technology, as it requires the switches to be physically close to each other and connected with backplane cables. A better option for this scenario would be to use Aruba Virtual Switching Framework (VSF) technology, which allows up to twoswitches to be interconnected using standard Ethernet links, creating a virtual switch that can span across different closets or racks.
• C. The customer needs to expand the network and make it possible for the current core switches to support more MAC forwarding and ARP entries. This scenario is not suitable for Aruba backplane stacking technology, as it does not increase the MAC or ARP table size of the switches. The MAC and ARP table size is determined by the hardware specifications of each switch model, and stacking them together does not change that. A better option for this scenario would be to upgrade the core switches to a higher-end model that supports more MAC and ARP entries, or to segment the network into smaller subnets to reduce the MAC and ARP traffic.
• D. The customer needs to deploy a switch at a branch office and have the switch automatically discover and join the network stack at the main office. This scenario is not suitable for Aruba backplane stacking technology, as it requires the switches to be on the same LAN and connected with backplane cables. A better option for this scenario would be to use Aruba Central, which is a cloud-based management platform that allows remote provisioning and monitoring of Aruba switches and other devices. Aruba Central can automatically discover and join the switch to the network, and apply the configuration and policies from the main office.

References:

• Aruba 2930M Switch Series - Data sheet)
• ArubaOS-Switch Virtual Switching Framework - Configuration guide)
• Aruba Central - Data sheet)