Can you clarify what your question is? The SSL authentication is one-way, the client verifies the server. The server verifies the client via their login information.
No, MemSQL uses the same port for SSL and non-SSL connections.
You may also need to configure the SSL certificate, as described in https://github.com/go-sql-driver/mysql#tls.
Most client libraries support connecting with SSL.
I've followed the memsql documentation and inserted the certificates to memsql master and aggregator, as well as made the permission check enabled, but still I'm able to get into the memsql without giving the rootCertificate in the login.
Is it possible the connection is already using SSL? It may be using SSL-preferred mode without verifying the certificate.