Collapsing Controllers to a Single Cluster in Central Europe

C.

In the scenario described, the network administrator is consolidating multiple wireless controllers from around the globe into a single cluster located in central Europe. This type of consolidation can be beneficial for several reasons, such as reducing administrative overhead, simplifying management and configuration, and improving scalability and resiliency.

However, there are also some potential concerns that should be addressed to ensure the success of this consolidation effort. Let's examine each of the answer choices in turn to determine which concern is the most relevant in this scenario:

A. Some channels may not be available consistently across the organization.

This answer refers to the availability of wireless channels across the entire organization. When wireless controllers are distributed across multiple locations, they can use different channels based on local regulations and interference levels. Consolidating these controllers into a single cluster may result in some channels being unavailable or unreliable in certain locations. However, this is not a major concern since the organization can perform a wireless site survey to determine the optimal channel plan for the entire environment, taking into account local regulations and interference sources.

B. Different RF policies per office are not available in this configuration.

This answer refers to the ability to apply different RF policies (e.g., transmit power, channel width, etc.) to different wireless networks based on their specific requirements. When controllers are distributed across multiple locations, each location can define its own RF policies. Consolidating these controllers into a single cluster may limit the ability to define different policies for different networks. However, modern wireless controllers can support multiple RF profiles that can be applied to different networks based on their requirements, even when all controllers are part of a single cluster. Therefore, this is not a major concern.

C. Syslog must be configured to the time-zone of the NMS platform.

This answer refers to the need to ensure that syslog messages generated by the wireless controllers are properly timestamped based on the time zone of the network management system (NMS) platform. This is important to ensure accurate logging and troubleshooting. However, this is not a major concern since most modern wireless controllers support the Network Time Protocol (NTP), which can be used to synchronize the time across all devices in the environment.

D. Centralized controllers cannot uniformly authenticate global users.

This answer refers to the challenge of providing consistent user authentication across the entire organization when all controllers are part of a single cluster. When controllers are distributed across multiple locations, they can use local authentication sources (e.g., Active Directory) to authenticate users based on their location. Consolidating these controllers into a single cluster may result in inconsistent authentication across different locations. However, this concern can be addressed by implementing a centralized authentication source (e.g., Cisco Identity Services Engine) that can provide consistent user authentication across all locations.

In conclusion, the most relevant concern in this scenario is the need to provide consistent user authentication across the entire organization when all controllers are part of a single cluster. However, this concern can be addressed by implementing a centralized authentication source. The other concerns mentioned are either not major concerns or can be addressed using modern wireless controller features and technologies.