CompTIA® A+ 220-901 and 220-902 is organized into 20 chapters, each pertaining to particular objec-tives on the exam. Because the official CompTIA objectives can have long names that sometimes deal with multiple subjects, the chapters are divided into more manageable (and memorable) topics. All the questions in this book refer to these topics. Chapter topics and the corresponding CompTIA objec-tives are listed in the beginning of each chapter.
For the most part, the exam topics in this book are structured to build on one another. Because of this, you should read this entire book in order to best prepare for the CompTIA A+ exams. If you want to review a particular topic, those topics are listed at the end of this introduction. In addition, you can use the index or the table of contents to quickly find the concept you are after.