tailieunhanh - CCENT/CCNA ICND1 Official Exam Certification Guide - Chapter 11

Wireless LANs Cho đến nay, cuốn sách này đã dành nhiều sự chú ý (có dây) Ethernet LAN. Mặc dù họ là cực kỳ quan trọng, một phong cách của mạng LAN, mạng LAN không dây (WLAN), điền vào một vai trò đặc biệt quan trọng trong việc cung cấp truy cập mạng cho người dùng cuối. Đặc biệt, các mạng WLAN cho phép người dùng để giao tiếp qua mạng mà không yêu cầu bất kỳ loại cáp, cho phép các thiết bị di động trong khi loại bỏ các chi phí và nỗ lực tham gia trong. | C H A P T E R 11 Wireless LANs So far this book has dedicated a lot of attention to wired Ethernet LANs. Although they are vitally important another style of LAN wireless LANs WLAN fills a particularly important role in providing network access to end users. In particular WLANs allow the user to communicate over the network without requiring any cables enabling mobile devices while removing the expense and effort involved in running cables. This chapter examines the basic concepts standards installation and security options for some of the most common WLAN technologies today. As a reminder if you re following the optional reading plan listed in the Introduction to this book you will be moving on to Chapter 1 of the CCNAICND2 Official Exam Certification Guide following this chapter. Do I Know This Already Quiz The Do I Know This Already quiz allows you to assess whether you should read the entire chapter. If you miss no more than one of these nine self-assessment questions you might want to move ahead to the Exam Preparation Tasks section. Table 11-1 lists the major headings in this chapter and the Do I Know This Already quiz questions covering the material in those sections. This helps you assess your knowledge of these specific areas. The answers to the Do I Know This Already quiz appear in Appendix A. Table 11-1 Do I Know This Already Foundation Topics Section-to-Question Mapping Foundation Topics Section Questions Wireless LAN Concepts 1-4 Deploying WLANs 5-7 Wireless LAN Security 8 9 300 Chapter 11 Wireless LANs 1. Which of the following IEEE wireless LAN standards uses only the U-NII band of frequencies around GHz a. b. c. d. 2. Which of the following answers is the correct maximum speed at which two IEEE WLAN devices can send data with a particular standard a. using OFDM at 54 Mbps b. using OFDM at 54 Mbps c. using DSSS at 54 Mbps d. using DSSS at 11 Mbps 3. Which of the following lists the .