Book excerpt: The CCNA 200-301 Network Simulator is a single-user software package. It helps users develop and improve hands-on configuration and troubleshooting skills without the investment in expensive lab hardware. This state-of-the-art, interactive simulation software enables you to practice your networking skills with hundreds of structured labs designed to help you learn by doing, the most effective method of learning. Experience realistic network device responses as you perform each lab, which include detailed instructions, topology diagrams, critical thinking questions, hints, and answers. Working through the labs, you will quickly become proficient with all the common Cisco IOS router and switch commands on the CCNA exam. Unlike other simulators on the market, the lab scenarios included in the CCNA 200-301 Network Simulator are far more complex, challenging you to learn how to perform real-world network configuration and troubleshooting tasks.