A guide to the most difficult portions of the Cisco Certification Exam - esp the hands-on lab portions. This will focus on the configuration and troubleshooting of Cisco bridges, routers and switches. ARS Limited is one of 9 certified Cisco trainers in the U.S. Writer, Bruce Caslow, is a CCIE (this exam has only a 30% pass rate) and has been working in the Cisco technology are for about 7 years.