Sentence: 'CCDA CCDP CCIE CCOP CCNA CCNP Cisco CiscoIOS , Cisco Systems , the Cisco Systems logo , and Networking Academy are registered trademarks or trademarks of Cisco Systems , Inc. and/or its affiliates in the U.S. and certain other countries .', Argument/Subject 1: 'cisco', Argument/Subject 2: 'cisco system'
be trademark of