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Cisco IOS - ADVANCED ENTERPRISE SERVICES v. 12.4(20)T - Complete Product - Firmware
Release 12.4(20)T, the latest release of the 12.4T family, adds significant embedded management enhancements, category-based productivity and security ratings support, multi-level Quality of Service (QoS) scheduling, and support for Cisco 860, 880, and 1861 routers.