CrowdStrike Falcon Certification Program CCFA-200 Reddit Questions

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

The option that may prevent a user from logging into Falcon via single sign-on (SSO) is that the SSO username doesn’t match their email address in Falcon. SSO is a feature that allows you to use an external identity provider (IdP) to authenticate and authorize users to access the Falcon platform. SSO simplifies and streamlines the login process, as users only need to remember one set of credentials for multiple applications. However, SSO requires that the username in the IdP matches the email address in Falcon for each user. If there is a mismatch between the username and the email address, the user will not be able to log into Falcon via SSO.

References: : [Cybersecurity Resources | CrowdStrike]

An inactive host that does not contact the Falcon cloud will be automatically removed from the Host Management and Trash pages after 90 days. An inactive host is a host that has not communicated with the Falcon platform for more than seven days. An inactive host will be moved from the Host Management page to the Trash page after seven days of inactivity. An inactive host will remain in the Trash page for 90 days before being permanently deleted from the Falcon platform. You can restore an inactive host from the Trash page if it becomes active again within 90 days1.

References: 1: Falcon Administrator Learning Path | Infographic | CrowdStrike

The command that would tell you if a Falcon Sensor was running on a Windows host is sc.exe query csagent. This command will show the status of the csagent service, which is responsible for running the sensor on Windows systems. The output of this command will indicate if the service is running, stopped, or paused. If the service is running, the sensor is also running3.

References: 3: How to Become a CrowdStrike Certified Falcon Administrator