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Fabian Riesen is technical leader at the Cisco Systems Technical Assistance Center (TAC) in Switzerland. He joined Cisco in 1999 as a project engineer. He owns a Swiss-Engineer degree from the University of Applied Sciences Winterthur/Zurich with specialization in software engineering and transmission technologies. He holds CCIE ISP-Dial and CCIE Wireless (#6268). Fabian was a reviewer for the Cisco Press book Deploying and Troubleshooting Cisco Wireless LAN Controllers and is the author of one of the CCIE Wireless Written and Lab examinations.