Prepare your CCNA exams with this CCNA Portable Command Guide book. This book will help you memorize commands and concepts as you work to pass the CCNA exam (INTRO 640-821, ICND 640-811, or CCNA 640-801). The guide summarizes all CCNA certification-level Cisco IOS® Software commands, keywords, command arguments, and associated prompts, providing you with tips and examples of how to apply the commands to real-world scenarios. Configuration examples throughout the book provide you with a better understanding of how these commands are used in simple network designs.