CCENT/CCNA ICND1 Official Exam Certification Guide - Chapter 7

Ethernet LAN Switching Concepts Chương 3, "Nguyên tắc cơ bản của mạng LAN," bao gồm các khái niệm và các thuộc tính vật lý của mạng LAN Ethernet một số tiền hợp lý của chi tiết. Chương này giải thích một loạt các khái niệm Ethernet, bao gồm cả vấn đề cơ bản của UTP cáp, các hoạt động cơ bản và khái niệm đằng sau trung tâm và chuyển mạch, so sánh các loại khác nhau của tiêu chuẩn Ethernet và Ethernet lớp liên kết dữ liệu khái niệm như địa chỉ và khung....
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CCENT/CCNA ICND1 Official Exam Certification Guide - Chapter 7 1828xbook.fm Page 165 Thursday, July 26, 2007 3:10 PM Part II: LAN Switching Chapter 7 Ethernet LAN Switching Concepts Chapter 8 Operating Cisco LAN Switches Chapter 9 Ethernet Switch Configuration Chapter 10 Ethernet Switch Troubleshooting Chapter 11 Wireless LANs 1828xbook.fm Page 166 Thursday, July 26, 2007 3:10 PM This chapter covers the following subjects: LAN Switching Concepts: Explains the basic processes used by LAN switches to forward frames. LAN Design Considerations: Describes the reasoning and terminology for how to design a switched LAN that operates well. 1828xbook.fm Page 167 Thursday, July 26, 2007 3:10 PM 7 CHAPTER Ethernet LAN Switching Concepts Chapter 3, “Fundamentals of LANs,” covered the conceptual and physical attributes of Ethernet LANs in a fair amount of detail. That chapter explains a wide variety of Ethernet concepts, including the basics of UTP cabling, the basic operation of and concepts behind hubs and switches, comparisons of different kinds of Ethernet standards, and Ethernet data link layer concepts such as addressing and framing. The chapters in Part II, “LAN Switching,” complete this book’s coverage of Ethernet LANs, with one additional chapter (Chapter 11) on wireless LANs. This chapter explains most of the remaining Ethernet concepts that were not covered in Chapter 3. In particular, it contains a more detailed examination of how switches work, as well as the LAN design implications of using hubs, bridges, switches, and routers. Chapters 8 through 10 focus on how to access and use Cisco switches. Chapter 8, “Operating Cisco LAN Switches,” focuses on the switch user interface. Chapter 9, “Ethernet Switch Configuration,” shows you how to configure a Cisco switch. Chapter 10, “Ethernet Switch Troubleshooting,” shows you how to troubleshoot problems with Cisco switches. Chapter 11, “Wireless LANs,” concludes Part II with a look at the concepts behind wireless LANs. “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 eight self-assessment questions, you might want to move ahead to the “Exam Preparation Tasks” section. Table 7-1 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. “Do I Know This Already?” Foundation Topics Section-to-Question Mapping Table 7-1 Foundation Topics Section Questions LAN Switching Concepts 1–5 LAN Design Considerations 6–8 1828xbook.fm Page 168 Thursday, July 26, 2007 3:10 PM 168 Chapter 7: Ethernet LAN Switching Concepts Which of the following statements describes part of the process of how a switch 1. decides to forward a frame destined for a known unicast MAC address? It compares the unicast destination address to the bridging, or MAC address, a. table. It compares the unicast source address to the bridging, or MAC address, table. b. It forwards the frame out all interfaces in the same VLAN except for the incom- c. ing interface. It compares the destination IP address to the destination MAC address. d. It compares the frame’s incoming interface to the source MAC entry in the MAC e. address table. Which of the following statements describes part of the process of how a LAN switch 2. decides to forward a frame destined for a broadcast MAC address? It compares the unicast destination address to the bridging, or MAC address, a. table. It compares the unicast source address to the bridging, or MAC address, table. b. It forwards the frame ou ...