In a high-client device turnover environment like an airport, the network management and monitoring solution needs to handle a large number of devices connecting and disconnecting frequently. This can put a significant load on the system. Therefore, it would be beneficial to recommend additional hardware resources beyond those typically recommended for the AirWare platform.  This would ensure that the system can handle the high turnover and provide reliable service 1 .

References :

Solution Architect - Scaled Agile Framework

 The correct answer is option C, voice. Voice applications have the greatest potential impact on RF design because they are sensitive to latency, jitter, and packet loss. Voice applications also require a minimum signal strength and signal-to-noise ratio to ensure good voice quality. Therefore, an architect needs to consider the number of voice devices, the codec used, the roaming behavior, and the call admission control when planning the RF coverage for voice applications.  References : The information can be referenced from the official HPE documents and learning materials available on HPE Press and Aruba Networks. Specifically, it aligns with the objectives outlined in Chapter 3: Wireless LAN Technologies and Standards, where the RF design considerations for voice applications are discussed. Designing Aruba Solutions Official Certification Study Guide Aruba Mobility Fundamentals Guide

One Aruba best practice for this design is to ensure that optimization and suppression of unnecessary multicast is enabled on the MCs. This is because multicast traffic can consume a lot of bandwidth and degrade the wireless performance, especially in a large building with many devices. By enabling optimization and suppression of unnecessary multicast, the MCs can reduce the amount of multicast traffic that is sent to the APs and the wireless clients, and improve the network efficiency and user experience.

Option A is incorrect because extending VLAN 10 to the edge and deploying Aruba APs on it is not a best practice for this design. This is because it creates a large broadcast domain that can increase the network congestion and complexity. It also exposes the VLAN 10 to potential security risks from the edge devices. Option B is incorrect because ensuring that each user role on the MCs is associated with a different VLAN ID is not a best practice for this design. This is because it creates a large number of VLANs that can increase the network overhead and management difficulty. It also limits the flexibility and scalability of the network design. Option C is incorrect because ensuring that the RADIUS server assigns users to different VLANs dynamically is not a best practice for this design. This is because it adds an extra layer of complexity and dependency to the network design. It also requires the RADIUS server to be configured and synchronized with the MCs and the VLANs, which can introduce potential errors and delays.  References : Aruba Validated Design: Campus Wireless LAN), ArubaOS 8.7 User Guide)

The Virtual Switching Framework (VSF) is a technology that allows two or more Aruba switches to operate as a single logical device, providing high availability, simplified management, and increased performance.  VSF is supported on Aruba 5400R zl2 switches, which are modular switches that can accommodate different types of line cards and power supplies 1 .

The VSF fabric requires two types of connections between the member switches: VSF links and VSF ports. VSF links are the physical connections that carry the VSF control and data traffic, while VSF ports are the logical interfaces that bundle the VSF links into a single logical link.  VSF links can be either 10 GbE or 40 GbE, and VSF ports can be either 10 GbE or 40 GbE 1 .

To create a VSF fabric with two 5406R zl2 switches, the architect needs to ensure that the switches have the compatible modules, transceivers, and cables for the VSF links and ports.  According to the ArubaOS-Switch Management and Configuration Guide 1 , the following requirements apply for the VSF fabric:

The switches must have the same chassis model, the same number and type of modules, and the same firmware version.

The switches must have at least one v3 module in slot A or B. The v3 modules are the ones with the letter “M” in the part number, such as J9990A, J9991A, and J9992A. The v2 modules are the ones with the letter “A” in the part number, such as J9534A, J9535A, and J9536A.

The switches must have the same type of transceivers and cables for the VSF links. The supported transceivers are the Aruba 10G SFP+ LC SR, the Aruba 10G SFP+ LC LR, the Aruba 40G QSFP+ LC SR4, and the Aruba 40G QSFP+ MPO SR4. The supported cables are the Aruba 10G SFP+ to SFP+ 1m DAC Cable, the Aruba 10G SFP+ to SFP+ 3m DAC Cable, the Aruba 40G QSFP+ to QSFP+ 1m DAC Cable, and the Aruba 40G QSFP+ to QSFP+ 3m DAC Cable.

Based on the exhibit, the architect has planned to use the Aruba 40G QSFP+ to QSFP+ 1m DAC Cable (JH234A) for the VSF links, which is a supported option. However, the architect has also selected the Aruba 24p 10GBASE-T v2 zl Module (J9536A) and the Aruba 20p 10GbE SFP+ v2 zl Module (J9535A) for the switches, which are not compatible with the VSF fabric. The architect should change these v2 modules to v3 modules, such as the Aruba 24p 10GBASE-T v3 zl2 Module (J9996A) and the Aruba 20p 10GbE SFP+ v3 zl2 Module (J9990A), to meet the VSF requirements.

The other options are not issues with the plan. Adding two QSPF+ MP0 SR4 transceivers (A) is not necessary, as the DAC cable already provides the 40 GbE connection for the VSF links. Adding stacking modules and cables © is not required, as the VSF fabric does not use the traditional stacking technology. Changing the power supply type (D) is not relevant, as the VSF fabric does not impose any restrictions on the power supply type.

References :  1 : ArubaOS-Switch Management and Configuration Guide - Aruba, Chapter 12: Virtual Switching Framework, pages 219-227.

The transceivers that the architect should recommend for each pair of switches are two QSPF+ MPO. This option would provide 40 Gbps bandwidth per link, which is enough to meet the customer requirement of 80 Gbps for the link aggregation. The QSPF+ MPO transceivers use a single multi-fiber connector that can support up to 12 fibers, which is compatible with the customer’s existing OM4 multi-mode fiber infrastructure. The QSPF+ MPO transceivers also support distances up to 100 meters, which is sufficient for the customer’s inter-building connections.

The other options are not optimal for the customer requirement because they either provide insufficient bandwidth or require additional fiber strands. Two QSPF+ BiDi transceivers would provide only 20 Gbps bandwidth per link, which is half of the customer requirement. Eight SFP+ LR or SR transceivers would provide 80 Gbps bandwidth per link, which is more than the customer requirement, but they would also require eight fiber strands per link, which is more than the customer’s available fiber infrastructure.  References :

Aruba Transceiver and Cable Data Sheet (Aruba Networks)

Designing Aruba Solutions Study Guide (HPE Press)

This answer is correct because it follows the best practice design for routing the wireless traffic in a VHD wireless solution. By having the MCs act at Layer2, the architect can enable the use of clustering, which provides high availability, load balancing, and seamless roaming for wireless users. By having the core routing switches act as the default gateway, the architect can avoid tunneling the wireless traffic to the MCs, which reduces the network overhead and latency. This also allows the core routing switches to apply security policies and QoS to the wireless traffic based on the user roles assigned by the MCs.  References :

Aruba Certified Design Professional Official Certification Study Guide (HPE6-A47) - Chapter 6)

Aruba Validated Reference Design: Very High Density 802.11ac Networks - Chapter 4)

Aruba Mobility Controller Clustering - Data sheet)

According to the Designing Aruba Solutions course, dedicated Air Monitors (AMs) are APs that are configured to scan all channels for wireless threats and perform wireless intrusion prevention system (WIPS) functions. One of the advantages of using dedicated AMs over APs that are doing WIPS in AP mode (hybrid) is that AMs can implement wireless containment on any channel on which they detect a threat without affecting the service of legitimate clients. Wireless containment is a technique that prevents rogue APs or clients from communicating with the network by sending deauthentication or disassociation frames to them. However, if an AP that is serving clients performs wireless containment on a different channel, it will have to switch channels frequently, which will degrade the performance and user experience of the clients. Therefore, dedicated AMs are recommended for customers who need effective and efficient wireless containment without compromising client service.

References :

Designing Aruba Solutions, Rev. 20.11 , Module 5: Aruba Security Design, page 5-13

Aruba Validated Reference Design: Wireless Intrusion Prevention System , page 10

 A metal firewall is a significant RF obstacle that can be difficult to see visually and might require access to blueprints. A metal firewall is a type of fire-resistant barrier that is made of metal or metal-clad materials and is used to separate different sections of a building or a network. A metal firewall can block or attenuate RF signals that pass through it, causing coverage gaps, signal degradation, or interference in the wireless deployment. A metal firewall can also reflect RF signals, creating multipath fading or distortion in the wireless environment. Therefore, an architect needs to identify the location and thickness of any metal firewalls in the building and account for their impact on the RF design. A metal firewall may require additional access points, antennas, or cabling to provide adequate coverage and performance across the wireless deployment. A metal firewall may also affect the channel planning, transmit power settings, and antenna orientation of the access points and radios. A metal firewall can be difficult to see visually, as it may be hidden behind walls, ceilings, or floors, or blended with other materials. Therefore, an architect might need access to blueprints or other sources of information to locate and measure any metal firewalls in the building.  References :

RF Design | Validated Solution Guide - Aruba

Managing and Optimizing RF Spectrum for Aruba WLANs | PDF - SlideShare

RF Optimization - Aruba

Advanced RF Design & Troubleshooting | PPT - SlideShare

 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)