This image shows the Topology Viewer. At the top from left to right are the View list (with Routing Group by Middleware) selected, Show Nodes list, Up arrow, Down arrow, Clock icon (for Unknown statuses), Find list, Annotations list, and Options list.
Below this in the Topology Viewer are the AdminServer, bam_server1, and cluster icons. The AdminServer has a connection on the right to the XE database. The bam_server1 has two connections on the right: one to the XE database and one to the orcl database.