Lab: 1. 871 router with 12.4T advipservicesk9 IOS - this one router alone covered about 70-80% of hands-on practice needed for the exam 2. Additional 831 router with 12.3T k9o3sy6 IOS - used together with the first router for Site-to-Site VPN, which is ~10-15% of lab practice. 3. 2950 switch with 12.1(22)EA IOS - used standalone for Layer 2 security, another ~10-15% of lab practice. These 3 units fully covered the blueprint, and I want to emphasize that all you really need is 1 x 12.4 k9 IOS router, 1 x 12.x k9 IOS router, and 1 x 12.x IP base IOS switch.