Rohith,
Due to the nature and scope of external security there are no quick test procedures. You would need to identify what portion of external security you want to test. Some of the basic type of security access are system entry validation, dataset access validation, or resource access validation. Once you determine what aspect of security you can create test cases to verify your security setup. Please let us know if this helps answer your question. Thanks.
Michael Blaha
ACF2 Support