Oracle DB 11gR2 netca installation failing
Answer from below thread solved my problem

https://forums.oracle.com/forums/thread.jspa?threadID=2208254

apparently '=' is not needed in responsefile argument in netca cmd

/u01/app/oracle/product/11.2.0/db_1/bin/netca /silent /responsefile /oracle_binaries/database/response/netca.rsp