HP HPE7-A01 - Aruba Certified Campus Access Professional Exam

To allow a new VLAN 100 between VSX pair inter-switch-link 256 for port 1/45 and 2/45, you need to use the command  vlan trunk allowed 100 in LAG256 . This will add VLAN 100 to the list of allowed VLANs on the trunk port LAG256, which is part of the inter-switch-link between VSX peers. The other options are incorrect because they either do not use the correct command or do not specify the correct port or VLAN. References: https://www.arubanetworks.com/techdocs/AOS-CX/10.04/HTML/5200-6728/bk01-ch07.html https://www.arubanetworks.com/techdocs/AOS-CX/10.04/HTML/5200-6728/bk01-ch02.html

For switches to participate in the same Multiple Spanning Tree Protocol (MSTP) region , their MST region configuration must match. One of the critical parameters is the configuration revision number , configured in AOS-CX using:

spanning-tree config-revision < REVISION-NUMBER >

HPE Aruba Networking explicitly states that all switches within an MST region must have identical revision numbers . The revision number forms part of the MST region identity along with the configuration name and VLAN-to-instance mapping. Aruba Networking

This is essential for VLAN load balancing because MSTP allows different VLAN groups to be mapped to different MST instances. Each instance can then use a different spanning-tree topology/root, allowing otherwise blocked redundant links to forward traffic for other VLAN groups. Aruba ' s MSTP configuration example specifically demonstrates that changing the root for individual instances permits more effective load sharing across redundant links. Aruba Networking

The spanning-tree priority does not need to be identical; in fact, different instance priorities are deliberately used when different switches should become roots for different MST instances. Likewise, “root” and “secondary root” describe root-election behavior rather than an MST region parameter that must be identical across Access-1 and the other participating switches.

Therefore, among the choices, spanning-tree config-rev is the required identical configuration.

Study Guide Topics: MSTP, MST Regions, Configuration Revision, VLAN-to-MSTI Mapping, Root Bridge Selection, VLAN Load Balancing.

MAC Caching is a feature that allows a guest user to bypass the captive portal page after the first authentication based on their MAC address 1  MAC Caching can be enabled under the splash page settings in Aruba Cloud Guest 2  MAC Caching can improve the user experience and reduce the network overhead by eliminating the need for repeated authentication.

The reason is that the Inter-Switch Link Protocol (ISLP) is a protocol that enables VSX stack join and synchronization between two VSX peer switches. ISLP uses a hello interval to exchange control messages between the switches.

The hello interval is a parameter that specifies the time interval between sending hello messages. The default value of the hello interval is 1 second. The hello interval can be configured from 1 second to 10 seconds.

https://www.arubanetworks.com/techdocs/AOS-CX/10.04/HTML/5200-6728/index.html

Change of Authorization (CoA) is a feature that allows ClearPass Policy Manager (CPPM) to send messages to network devices such as switches to change the authorization state of a user session. CoA requires that both CPPM and the network device support this feature and have it enabled. For AOS-CX switches, CoA must be globally enabled using the command  radius-server coa enable . If CoA is not enabled on the switch, the disconnect CoA message from CPPM will be ignored and the user session will not be terminated. References: https://www.arubanetworks.com/techdocs/ClearPass/6.7/PolicyManager/index.htm#CPPM_UserGuide/Admin/ChangeOfAuthorization.htm https://techhub.hpe.com/eginfolib/Aruba/OS-CX_10.04/5200-6692/GUID-9B8F6E8F-9C7A-4F0D-AE7B-9D8E6C5B6A7F.html

The likely cause of the issue of weak Wi-Fi coverage in the office is that the AP is using a directional antenna. A directional antenna is an antenna that radiates or receives radio waves more strongly in one or more directions, creating a focused beam of signal. A directional antenna can provide better coverage and performance for a specific area, but it can also create dead zones or weak spots for other areas. The other options are incorrect because they either do not affect the Wi-Fi coverage or do not match the scenario. References: https://www.arubanetworks.com/techdocs/ArubaOS_86_Web_Help/Content/arubaos-solutions/wlan-rf/rf-fundamentals.htm https://www.arubanetworks.com/techdocs/ArubaOS_86_Web_Help/Content/arubaos-solutions/wlan-rf/antennas.htm

The Aruba CX 6400 switch is a modular switch that supports high-performance and high-density Ethernet switching for campus and data center networks. One of the features that distinguishes the Aruba CX 6400 switch from most typical campus switches is virtual output queueing (VOQ).  VOQ is a technique that implements large ingress packet buffers on each port to prevent head-of-line blocking and packet loss due to congestion 2 .  VOQ allows each port to have multiple queues for different output ports and prioritize packets based on their destination and QoS class 2 .  VOQ enables the Aruba CX 6400 switch to achieve high throughput and low latency for various traffic types and scenarios. References:  2  https://www.arubanetworks.com/assets/ds/DS_CX6400Series.pdf

The primary benefit of BSS coloring is D. BSS color tags are applied to Wi-Fi channels and can reduce the threshold for interference.

BSS coloring is a mechanism that allows Wi-Fi 6 devices to mark each frame with a color code that identifies the BSS (Basic Service Set) it belongs to. This helps differentiate between frames from different BSSs that share the same channel and avoid unnecessary collisions and backoffs. BSS coloring also introduces an adaptive threshold for interference, which means that Wi-Fi 6 devices can adjust the signal strength value that determines whether a channel is busy or not based on the current network environment. This allows for more efficient use of spectrum and higher throughput in dense scenarios 1 2 .

The Equivalent Isotropic Radiated Power (EIRP) is the measured radiated power of an antenna in a specific direction. It is also called Equivalent Isotropic Radiated Power. It is the output power when a signal is concentrated into a smaller area by the Antenna. The EIRP can take into account the losses in transmission line, connectors and includes the gain of the antenna. It is represented in dB 2 . The formula for EIRP is:

EIRP = PT − Lc + Ga

where PT is the output power of the transmitter in dBm, Lc is the cable and connector loss in dB, and Ga is the antenna gain in dBi.

For AP1, the EIRP can be calculated as:

EIRP = 16 − 4 + 8 = 20 dBm

Therefore, the answer B is correct.