Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_17402 ( "Vendor and type" text, "Models" text, "NetFlow Version" text, "Implementation" text, "Comments" text )

### Question ###
How many netflow version are there when the vendor and type is enterasys switches?

### Accurate SQL ###

SELECT COUNT("NetFlow Version") FROM table_17402 WHERE "Vendor and type" = 'Enterasys Switches'