CCENT/CCNA ICND1 Official Exam Certification Guide - Chapter 10

Ethernet Switch Troubleshooting Chương này có hai mục tiêu chính. Đầu tiên, nó bao gồm các Ethernet theo định hướng chủ đề còn lại cho cuốn sách này - cụ thể, một số các lệnh và các khái niệm có liên quan để xác minh rằng một chuyển mạch Ethernet LAN hoạt động. Nếu mạng không hoạt động, chương này cho thấy các công cụ bạn có thể sử dụng để tìm hiểu lý do tại sao. Ngoài ra, chương này cho thấy một số phương pháp xử lý sự cố và thực tiễn có thể cải thiện kỹ...
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CCENT/CCNA ICND1 Official Exam Certification Guide - Chapter 10 1828xbook.fm Page 267 Thursday, July 26, 2007 3:10 PM 10 CHAPTER Ethernet Switch Troubleshooting This chapter has two main goals. First, it covers the remaining Ethernet-oriented topics for this book—specifically, some of the commands and concepts related to verifying that a switched Ethernet LAN works. If the network doesn’t work, this chapter suggests tools you can use to find out why. Additionally, this chapter suggests some troubleshooting methods and practices that might improve your troubleshooting skills. Although the troubleshooting processes explained in this book are not directly tested on the exams, they can help you prepare to correctly answer some of the more difficult exam questions. “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 10-1 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 10-1 Foundation Topics Section Questions Perspectives on Network Verification and Troubleshooting — Verifying the Network Topology with Cisco Discovery Protocol 1, 2 Analyzing Layer 1 and 2 Interface Status 3–6 Analyzing the Layer 2 Forwarding Path with the MAC Address Table 7, 8 1828xbook.fm Page 268 Thursday, July 26, 2007 3:10 PM 268 Chapter 10: Ethernet Switch Troubleshooting Imagine that a switch connects via an Ethernet cable to a router, and the router’s 1. hostname is Hannah. Which of the following commands could tell you information about the IOS version on Hannah without establishing a Telnet connection to Hannah? show neighbor Hannah a. show cdp b. show cdp neighbor c. show cdp neighbor Hannah d. show cdp entry Hannah e. show cdp neighbor detail f. Which of the following CDP commands could identify a neighbor’s model of hardware? 2. show neighbors a. show neighbors Hannah b. show cdp c. show cdp interface d. show cdp neighbors e. show cdp entry hannah f. The output of the show interfaces status command on a 2960 switch shows interface 3. Fa0/1 in a “disabled” state. Which of the following is true about interface Fa0/1? The interface is configured with the shutdown command. a. The show interfaces fa0/1 command will list the interface with two status codes b. of administratively down and down. The show interfaces fa0/1 command will list the interface with two status codes c. of up and down. The interface cannot currently be used to forward frames. d. The interface can currently be used to forward frames. e. Switch SW1 uses its gigabit 0/1 interface to connect to switch SW2’s gigabit 0/2 4. interface. SW2’s Gi0/2 interface is configured with the speed 1000 and duplex full commands. SW1 uses all defaults for interface configuration commands on its Gi0/1 interface. Which of the following is true about the link after it comes up? The link works at 1000 Mbps (1 Gbps). a. SW1 attempts to run at 10 Mbps because SW2 has effectively disabled IEEE b. standard autonegotiation. 1828xbook.fm Page 269 Thursday, July 26, 2007 3:10 PM “Do I Know This A ...