Remote Access Technologies Trước đó trong cuốn sách này, bạn đã học về Ethernet LAN, WAN điểm-to-point liên kết, và Frame Relay. Tất cả các công nghệ này có thể được sử dụng để kết nối một trang web của công ty Internet. Tuy nhiên, không ai trong số các tùy chọn này là chi phí-hiệu quả để kết nối người sử dụng nhà tiêu biểu dựa trên Internet. Trong chương này, bạn sẽ tìm hiểu về một số công nghệ khác nhau được sử dụng để truy cập Internet từ nhà. Một số các công nghệ này tương. | C H A P T E R Remote Access Technologies Earlier in this book you learned about Ethernet LANs point-to-point WAN links and Frame Relay. All of these technologies can be used to connect a corporate site to the Internet. However none of these options is cost-effective for connecting the typical home-based user to the Internet. In this chapter you will learn about several different technologies used for Internet access from the home. Some of these same technologies can be used to remotely access corporate networks as well. This chapter covers the most common remote access technologies namely analog modems DSL ISDN and cable. AUTHOR S NOTE While they may be on the CCNA exam the topics in this chapter are less likely to be on the CCNA exam than most other topics in this book. For those of you that are planning to take the CCNA exam instead of taking both the INTRO and ICND exams you might consider skipping this chapter. Refer to the introduction to this book for more perspectives on the CCNA exam topics. Do I Know This Already Quiz The purpose of the Do I Know This Already quiz is to help you decide whether you really need to read the entire chapter. If you already intend to read the entire chapter you do not necessarily need to answer these questions now. The 15-question quiz derived from the major sections in the Foundation Topics portion of the chapter helps you determine how to spend your limited study time. 430 Chapter 15 Remote Access Technologies Table 15-1 outlines the major topics discussed in this chapter and the Do I Know This Already quiz questions that correspond to those topics. Table 15-1 Do I Know This Already Foundation Topics Section-to-Question Mapping Foundations Topics Section Questions Covered in This Section Perspectives on the PSTN 1 2 Analog Modems 3 4 ISDN 5 7 DSL 8 10 Cable Modems 11 12 Comparisons of Remote Access Technologies 13 15 CAUTION The goal of self-assessment is to gauge your mastery of the topics in this chapter. If you do not know
