Client-to-node encryption protects data in flight from client machines to a database
cluster using SSL (Secure Sockets Layer). It establishes a secure channel between the client
and the coordinator node.
Node-to-node encryption protects data transferred between nodes, including gossip
communication, in a cluster using SSL (Secure Sockets Layer).
Using cqlsh with SSL encryption
Using a .cqlshrc file, or cqlshrc file in Cassandra 1.2.9 and later, means you don't have to override the
SSL_CERTFILE environmental variables every time.