After you cover all the exam objectives for Cisco Systems' in CCNA For Dummies, such tasks following network protocols, routing, and maintaining network security will become a new tool to increase your skills. First, expect to become familiar with the language of the exam with the expert guidance of your certified authors. Then, find your way around the work of the OSI model and its layers: data link, network, transport, and the upper layer. CD-ROM book helps you assess your weak spots through a test machine and a variety of test scenarios, and ten sites to boost your studying are also included.