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To load balance the data coming through NMSP from the WLCs and spread the load between multiple CMX servers, the configuration cmxctl config feature flags nmsplb.cmx-ap-grouping true should be used. This enables the load balancing feature and helps optimize the data flow for APs in a large network environment. References: The configuration for load balancing in CMX is explained in the certification guide, which outlines the commands and flags necessary to manage data flow efficiently.

 The issue described indicates that authentication requests from the wireless network to the RADIUS server are being dropped. This problem is often due to a mismatch in shared-secret keys between the wireless controller and the RADIUS server. The shared secret is a password-like value that must be configured on both sides to ensure secure communication. By configuring both sides with matching shared-secret keys, it ensures that authentication messages are properly encrypted and decrypted by each party, allowing for successful user connection. References: (CCNP Enterprise Wireless Design ENWLSD 300-425 and Implementation ENWLSI 300-430 Official Cert Guide)

With the implementation of a BYOD policy, the security director should be concerned about malware and lost and stolen devices. Malware can compromise the corporate network if infected devices connect to it. Lost and stolen devices pose a risk of unauthorized access to corporate data and resources, potentially leading to data breaches. References := (CCNP Enterprise Wireless Design ENWLSD 300-425 and Implementation ENWLSI 300-430 Official Cert Guide)

The FlexConnect AP Upgrade feature allows for a selective upgrade process within a FlexConnect group. By not setting any master APs, the WLC will automatically select one AP of each model with the lowest MAC address to receive the upgrade directly from the controller. This ensures that the upgrade is distributed efficiently across different AP models in the group without manual intervention.

References := (CCNP Enterprise Wireless Design ENWLSD 300-425 and Implementation ENWLSI 300-430 Official Cert Guide)

 To control administrative access to the WLC using Active Directory without concern for RBAC post-authentication, the engineer would configure a RADIUS server (option D) and a TACACS server (option E). These servers can integrate with Active Directory to authenticate users, and once authenticated, the admin user’s access level can be determined without the need for additional role-based access control configurations within the WLC. References: CCNP Enterprise Wireless Design ENWLSD 300-425 and Implementation ENWLSI 300-430 Official Cert Guide, focusing on the integration of WLC with RADIUS and TACACS servers for administrative access control.

Enabling unicast AP multicast mode can correct the issue of increased controller CPU overhead and overall network utilization after multicast is enabled. This mode allows the controller to send multicast traffic to the APs as unicast, which is more efficient for the wireless medium and reduces the load on the controller’s CPU.

References := ( CCNP Enterprise Wireless Design ENWLSD 300-425 and Implementation ENWLSI 300-430 Official Cert Guide )

 For a startup company without LDAP, using the internal database of the RADIUS server is a viable solution to authenticate wireless users. This approach allows the company to maintain a directory of users within the RADIUS server itself, providing similar security and user experience as LDAP would. Users can be authenticated against this internal database, ensuring secure access to the wireless network. References: CCNP Enterprise Wireless Design ENWLSD 300-425 and Implementation ENWLSI 300-430 Official Cert Guide

 Link-Local Service (LSS) filtering for mDNS (Multicast Domain Name System) is used to control the propagation of mDNS services across the network. To enable LSS for the AppleTV mDNS service only when ORIGIN is set to Wired, the correct action is to set ORIGIN to Wired and enable LSS specifically for the AppleTV service. References: CCNP Enterprise Wireless Design ENWLSD 300-425 and Implementation ENWLSI 300-430 Official Cert Guide

 In a self-registration setup for guest/BYOD devices, when an employee tries to connect multiple devices simultaneously, the system allows the registration of all devices. However, it restricts the active connection to only one device at a time. This ensures that network resources are not overburdened by a single user connecting multiple devices. References := (CCNP Enterprise Wireless Design ENWLSD 300-425 and Implementation ENWLSI 300-430 Official Cert Guide)

 If the administrator is unable to see interferers on the Cisco Prime Infrastructure maps, it could be due to the MSE (Mobility Services Engine) not being added and synchronized with Cisco Prime Infrastructure, which is essential for tracking and locating devices, including interferers. Additionally, if interferer tracking is not enabled on the MSE, it would not track or display the location of interferers on the maps. The other options, such as SNMP failure, reaching the Context Aware Service tracking limit, or inactive NSMP communication, would affect other aspects of network visibility but not specifically the tracking and display of interferers. References: CCNP Enterprise Wireless Design ENWLSD 300-425 and Implementation ENWLSI 300-430 Official Cert Guide