Patrick Warichet is a technical marketing engineer for the campus switching systems technology group. He is specialized in Cisco IOS modularity and has expertise in Quality of Service (QoS) and hardware architecture for the Catalyst 6500. He has worked for the data center, switching & services (DCSS) group in the customer operation group. Within this group Patrick worked on customer critical issues focusing on the Catalyst 6500. Prior to join DSSG, Patrick was a customer support engineer for the LAN Switching group in Brussels (Belgium). Prior to joining Cisco, he was a consultant for Digital Equipment Corporation, focusing on European commission network operation. Patrick is an industrial engineer from the Industrial Engineering School of Brussels, Belgium.