All of the components deployed in a Remote Services cluster can support TLS-encrypted communication. The Cluster Manager and the Compute Server nodes can be configured to use HTTPS with TLS v1.2. MongoDB also supports encrypted communications and data encryption at rest, if necessary.
In addition, you have the option to use the Cluster Manager or the load balancer in front of the Cluster Manager to terminate the TLS encryption. In this case, HTTPS is used by clients, but internal communication between the Cluster Manager and the nodes can be unencrypted using HTTP. This is convenient when the cluster nodes reside in an isolated, secure network.