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Dynamic Multicast Optimization (DMO) is a feature that enhances the delivery of multicast traffic by optimizing the data rate. The before and after optimization images show a significant increase in the data rate, which is a typical result of DMO being configured, as it allows multicast traffic to be transmitted at higher data rates by converting multicast streams into unicast streams for the clients that need them.

VoIP quality can be negatively impacted by insufficient cell overlap in AP deployment plans, which can cause poor handoffs between APs as a user moves around. This results in a degraded VoIP experience. Additionally, roaming into an area with continuous Zigbee operation can cause interference with the 5GHz frequency band, further contributing to poor VoIP call quality. The Zigbee communication protocol operates on the same frequency band as Wi-Fi and can introduce noise and interference, which leads to a reduced MOS score, as reported by the VoIP engineer.

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