xi A+ Note Th e A+ Note feature provides students with tips and facts regarding the CompTIA A+ Certifi cation Exam. Th ese tips will help students study for the certifi cation exam. Caution Th e Caution feature highlights important personal- and machine-safety information students need to know be- fore performing networking tasks. Th ese alert students to actions that may cause personal injury or damage to a computer or electronic device. End-of-Chapter Content End-of-chapter material provides an opportunity for re- view and application of concepts. ■ A concise Chapter Summary reiterates the Learning Outcomes and provides a brief review of the content for student reference. Th is helps students focus on important concepts presented in the text. ■ Review questions highlight basic concepts presented in the chapter so students can evaluate their understanding of the material. ■ Sample A+ Exam Questions challenge students to answer questions similar to those they will face on the CompTIA A+ Certifi cation Exam, providing a sample of what to expect on the exam.