Core Solutions of Exchange Server 2013: (04) Configuring the Message Transport

In this module you'll learn how to configure database availability groups and find out about load balancing and recovery options.
Full course outline:
We add the First node to the security tab, because it will have permissions to add other nodes to the cluster .
if this node is removed, you cannot add remove nodes to cluster, until another node is assigned with permissions, on CNO , especially for "add remove nodes " full control may not be necessary.
Sam