returns the protocol for the service being queried i.e. '' _ tcp '' . concode_field_sep String protocol concode_elem_sep int port concode_elem_sep String service concode_elem_sep String name concode_elem_sep int weight concode_elem_sep int priority concode_elem_sep String target concode_field_sep int port concode_elem_sep String service concode_elem_sep String name concode_elem_sep int weight concode_elem_sep int priority concode_elem_sep String target
String function ( ) { return protocol ; }