Explanation
The likely reason your Windows host would be in Reduced Functionality Mode (RFM) is that the host lost internet connectivity. RFM is a mode that limits the sensor's functionality due to license expiration, network connectivity loss, or certificate validation failure. When a Windows sensor is in RFM, it will only provide basic prevention capabilities, such as blocking known malware hashes and preventing script execution from the %TEMP% directory. The sensor will not send any telemetry or detection events to the Falcon platform, and will not receive any policy or update changes from the Falcon cloud1. Losing internet connectivity is a common cause of RFM, as it prevents the sensor from communicating with the Falcon cloud. A misconfiguration in your prevention policy or sensor update policy will not cause RFM, as these policies are applied by the Falcon cloud and do not affect the sensor's license, network, or certificate status. Microsoft updates altering the kernel may cause compatibility issues with the sensor, but not RFM3.
References: 1: Falcon Administrator Learning Path | Infographic | CrowdStrike 3: How to Become a CrowdStrike Certified Falcon Administrator

Explanation
An exclusion is a rule that tells the Falcon platform to ignore certain files, folders, processes, or registry keys when performing prevention or detection actions. An administrator can create an exclusion and apply it to one or more groups of hosts, or to all hosts in the organization. For example, an administrator can create an exclusion for a legitimate application that is causing false positives and apply it to the group of hosts that are running that application.

Explanation
The Unique Hosts Connecting to Countries Map helps an administrator to visualize global network communication. The map shows the number of unique hosts in your environment that have established network connections to different countries in the past 24 hours. You can use this map to identify unusual or suspicious network activity, such as connections to high-risk countries or regions, or connections from hosts that are not expected to communicate with external entities2.
References: 2: Cybersecurity Resources | CrowdStrike