The distributed computing architecture of Hadoop works in a different way. All the nodes in the cluster can connect to each other using SSH. There is no specific port that needs to be opened for that. All the Daemons which are running on specific ports are able to communicate and respond to Remote Procedure Calls. There are a few options to set up security viz. Kerberos authentication, Apache Sentry and Apache Knox. The concepts around the relevant security principles would be explained by the instructor.