doc/modules/cassandra/examples/CQL/create_ks.cql

CREATE KEYSPACE excelsior
   WITH replication = {'class': 'SimpleStrategy', 'replication_factor' : 3};

CREATE KEYSPACE excalibur
   WITH replication = {'class': 'NetworkTopologyStrategy', 'DC1' : 1, 'DC2' : 3}
   AND durable_writes = false;