You need to create a node agent but you will not start it at this point.
Node agents are responsible for communications between your domain administration server and server instances or clusters. You create a node agent by executing the asadmin create-node-agent command, as shown, where nodeAgentName is the name of your node agent.
asadmin create-node-agent nodeAgentName Command create-node-agent executed successfully.
If you don't specify a node agent name, the hostname of your system will be used. If you create a node agent on a different server, you must also specify host and port information for your domain administration server by passing the --host hostname and --port portnumber options to the asadmin command.