Oracle Exadata requires a minimum of three networks, and there are interfaces available for additional networks. Each network must be on a separate and distinct subnet.

Describes the release types for Oracle Exadata System Software

However, DBCA is not recommended for new database creation on Exadata because it does not integrate with the OEDA XML configuration file (es.xml) and may not implement the recommended Exadata-specific configuration settings.

Exadata Software release frequency and types

Exadata Interview Questions – Part 1