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The Cisco Catalyst 3550 Series Switch is a stackable, multilayer switch that provides high availability, quality of service (QoS), and security to enhance network operations. With a range of Fast Ethernet and Gigabit Ethernet configurations, the Cisco Catalyst 3550 Series is a powerful option for enterprise and metro access applications. Customers can deploy industry-leading intelligent services, such as advanced QoS, rate limiting, Cisco security access control lists, multicast management, and high-performance IP routing, and maintain the simplicity of traditional LAN switching.