True or False: Once devices in HA are registered, you can no longer manually add cluster members.

The statement is false because, in a high availability (HA) setup, once devices are registered as members of a cluster, it is still possible to manually add additional cluster members. This flexibility allows network administrators to accommodate changes in network architecture, such as scaling the system by adding more devices as needed to ensure continued performance and redundancy.

While there might be specific configurations or states in which adding members could be restricted temporarily (like during a firmware update or if HA is in a particular state), the general functionality allows for manual addition of members at any time as part of routine management. This is an important aspect of managing high availability systems, ensuring that they can grow and adapt according to the network's requirements.