HPE7-A07 Exam Dumps - Aruba Certified Campus Access Mobility Expert Written Exam

To address connectivity issues when students are working outdoors, increasing the transmission (TX) power range for the 5GHz radios can help improve signal strength and coverage. The setting shown indicates a conservative approach to power settings, which might not provide sufficient coverage for outdoor areas. By increasing the power range, you can extend the wireless signal reach, which aligns with best practices for outdoor wireless coverage.

Comprehensive and Detailed Explanation (Verified Extract from HPE Aruba Networking Switching Documentation)

VOQ (Virtual Output Queuing) is a hardware-based queuing mechanism used in the ArubaOS-CX architecture to prevent head-of-line blocking and minimize packet drops in high-throughput environments.

How VOQ Works:

Each ingress port maintains a separate queue for every egress port in the system.

When a packet arrives, it is placed in the ingress buffer corresponding to its destination egress port.

This structure ensures that traffic destined for one congested egress port does not block packets heading to other ports.

This architecture is critical in high-speed modular switches and aggregation cores (such as the Aruba 8400 and 10000 Series), allowing the fabric interconnect to forward traffic efficiently without dropping packets due to port congestion.

ArubaOS-CX Technical Extract:

“Virtual Output Queuing (VOQ) provides per-egress-port queuing at ingress buffers, preventing head-of-line blocking and ensuring high throughput across the switch fabric. Each ingress queue corresponds to a specific egress port, allowing packets to be transmitted as soon as the egress port becomes available.”

Option Analysis:

A. Incorrect – Refers to priority marking (QoS), not VOQ operation.

B. Correct – VOQ provides ingress buffers with queues for each egress port, reducing dropped packets and head-of-line blocking.

C. Incorrect – VOQ is not related to LACP or VSX link aggregation.

D. Incorrect – VOQ does not dynamically allocate egress buffer space; it segregates ingress queues per egress destination.

Final Verified Answer: B

Reference Sources (HPE Aruba Official Materials):

Aruba AOS-CX Technical Architecture Overview – Virtual Output Queuing (VOQ)

Aruba 8400/10000 Series Switches Hardware and Performance Guide

Aruba Certified Switching Expert (ACSE) Study Guide – Switch Fabric and Queuing Mechanisms

The command shown in the exhibit is:

Access-1# show ubt state

This command displays the User-Based Tunneling (UBT) status on an Aruba CX switch. UBT allows wired access devices (like CX 6300/6400) to extend tunneled connectivity to Aruba gateways, using GRE tunnels for user traffic.

The output contains the following sections:

1. Local Conductor Server (LCS) State

Primary : 172.16.200.252 ready_for_bootstrap operational_primary

Secondary : 172.16.200.253 ready_for_bootstrap operational_secondary

This confirms that two gateways (IP 172.16.200.252 and 172.16.200.253) form an LCS pair in an Aruba gateway cluster.

Exact extract:

“The Local Conductor Servers (LCS) represent the pair of Aruba Gateways that control and terminate UBT tunnels. One operates as the primary (active) and the other as the secondary (standby). These gateways must be configured as a cluster pair.”

2. Switch Anchor Controller (SAC) State

Active : 172.16.200.252 20:4c:03:81:e7:ca registered

Standby : 172.16.200.253 20:4c:03:b2:12:0a registered

Both gateways are registered as active and standby switch anchor controllers. This is a clear indication that the switch (Access-1) has successfully established tunnels to both gateways within the cluster.

Exact extract:

“The Switch Anchor Controller (SAC) section lists both cluster members to which the switch forms GRE tunnels. The switch maintains active and standby tunnels for redundancy.”

3. User Anchor Controller (UAC) State

Each connected user is mapped to a User Anchor Controller (UAC) — one of the two gateways — depending on cluster load balancing:

User Anchor Controller (UAC): 172.16.200.252

User Anchor Controller (UAC): 172.16.200.253

Each user session is anchored on a specific gateway within the cluster. The presence of two different UAC IPs confirms that users are being distributed across both gateways — a behavior that occurs only in a clustered gateway configuration.

Exact extract:

“In a clustered gateway deployment, each user session is dynamically anchored to one of the gateways. The UAC field shows which gateway currently handles each user session.”

Conclusion:

From the output:

Two gateways are shown as primary and secondary LCS.

Both are registered as SACs (tunnel endpoints).

Users are distributed across both gateways as UACs.

This confirms that Access-1 (the CX switch) has established GRE tunnels to a pair of gateways within a cluster.

Hence, the correct answer is A. A pair of gateways within a cluster.

Why the Other Options Are Incorrect:

B. A pair of switches running VXLAN:UBT tunnels are GRE-based and terminate on Aruba Gateways, not VXLAN-enabled switches.

“User-Based Tunneling uses GRE tunnels to Aruba Gateways; VXLAN is not used for UBT.”

C. A single gateway within a cluster:The output explicitly shows two controllers (active and standby) registered — not a single one.

D. A pair of standalone gateways:The LCS state shows primary/secondary operational roles, which exist only in a cluster, not standalone gateways.

References of HPE Aruba Networking Switching Documents or Study Guide:

ArubaOS-CX Access Security and UBT Configuration Guide – “Understanding User-Based Tunneling (UBT), LCS, SAC, and UAC roles.”

Aruba Gateway Clustering and Redundancy Guide – “Cluster operation and role distribution for UBT.”

Aruba Campus Wired and Wireless Integration Guide – “How CX switches form UBT tunnels to clustered Aruba gateways.”

Aruba Zero Trust Access Design Guide – “High availability with UBT across gateway clusters.”

Comprehensive and Detailed Explanation (Verified Extract from HPE Aruba Networking Wireless Documentation)

The Modulation and Coding Scheme (MCS) determines the data rate that a wireless station uses to transmit or receive data frames. The MCS index selection depends primarily on the signal quality and error conditions observed on the wireless link.

Two factors have a direct and measurable influence:

1. Signal-to-Noise Ratio (SNR)

A higher SNR means better signal quality and less interference, allowing the station to use higher-order modulations (e.g., 64-QAM, 256-QAM, 1024-QAM) corresponding to higher MCS indexes.

When SNR decreases, the client dynamically reduces its MCS rate to maintain reliability.

“Stations dynamically select the highest MCS index that the current SNR can support to maintain an acceptable frame error rate.”

2. Retry Rate

The retry rate reflects retransmissions due to poor frame reception. A high retry rate indicates a high error rate, prompting the station to step down to a lower MCS to improve link stability.

“If retransmissions increase, the MCS rate is reduced until the error rate stabilizes.”

Other Options Explanation:

B. Channel utilization: affects airtime efficiency but not MCS selection directly.

C. Number of connected clients: impacts contention and throughput, not MCS per station.

E. Frequency band: influences propagation and SNR indirectly but does not directly control MCS selection.

✅ Final Verified Answers: A and D

📘 Reference Sources (HPE Aruba Official Materials):

Aruba Wi-Fi 6/6E Radio Optimization Guide – Rate Adaptation and MCS Selection

Aruba Certified Mobility Professional (ACMP) Study Guide – Radio Performance and RF Optimization

Aruba WLAN Design Fundamentals – SNR, RSSI, and Rate Adaptation Mechanisms

In HPE Aruba ClearPass Guest configuration, the “Address” field defines the Fully Qualified Domain Name (FQDN) of the captive portal server that users are redirected to when accessing the guest network.

When a wildcard certificate is used, such as *.aruba-training.com, the derived FQDN for the captive portal redirection automatically becomes:

captiveportal-login.aruba-training.com

This naming convention is required so that the Common Name (CN) or Subject Alternative Name (SAN) in the SSL certificate matches the domain presented to the client browser during HTTPS redirection.

If the “Address” field is incorrectly configured with just aruba-training.com, the certificate and the redirection URL will not match, causing the browser to block or fail the authentication process. This results in users being unable to browse after pressing Connect on the portal page.

HPE Aruba documentation states:

“When using a wildcard certificate (for example CN = *.domain.com) on ClearPass Guest, the web login redirection address must be configured as captiveportal-login.domain.com to ensure the HTTPS certificate name matches the redirection hostname.”

“If the address field does not match the derived hostname of the certificate, browser trust validation fails and users cannot proceed beyond the captive portal page.”

Additionally, the ArubaOS and ClearPass Guest deployment guide clarifies that wildcard certificates are fully supported for guest portals, provided that the Address field follows the proper naming pattern.

Incorrect Configurations:

Setting “Address” to aruba-training.com causes SSL mismatch errors.

Leaving the “Address” blank defaults to a local IP or hostname mismatch.

Correct Configuration:

“Address” should be set to captiveportal-login.aruba-training.com when the wildcard certificate is *.aruba-training.com.

Option Explanations:

A. Incorrect – this does not follow the certificate’s derived FQDN format.

B. Correct – matches the expected derived FQDN for wildcard certificates.

C. Incorrect – HTTPS certificates are required for secure guest portals.

D. Incorrect – Wildcard certificates are supported by ClearPass Guest and ArubaOS.

Final Verified Answer: B

Reference Sources (HPE Aruba Networking Official Materials):

Aruba ClearPass Guest Configuration and Deployment Guide

ArubaOS 8.x User Guide – Captive Portal and Authentication Configuration

HPE Aruba ClearPass Certificates 101 Technical Note

ArubaOS-Switch and ClearPass Integration Guide