CCENT/CCNA ICND1 Official Exam Certification Guide - Chapter 15

Troubleshooting IP Routing Chương này có hai mục tiêu chính.Đầu tiên, chương này bao gồm một số chủ đề không được đề cập ở những nơi khác trong cuốn sách này, cụ thể là một số lệnh xử lý sự cố trên cả hai máy chủ và bộ định tuyến. Thứ hai, chương này đánh giá các khái niệm cốt lõi của địa chỉ và định tuyến, nhưng với một tập trung vào làm thế nào để tiếp cận vấn đề mới để phân tích và hiểu làm thế nào để khắc phục sự cố bất kỳ vấn đề....
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CCENT/CCNA ICND1 Official Exam Certification Guide - Chapter 15 1828xbook.fm Page 471 Thursday, July 26, 2007 3:10 PM 15 CHAPTER Troubleshooting IP Routing This chapter has two main goals. First, this chapter covers some topics that are not covered elsewhere in this book, namely some troubleshooting commands on both hosts and routers. Second, this chapter reviews the core concepts of addressing and routing, but with a focus on how to approach new problems to analyze and understand how to troubleshoot any problems. Additionally, this chapter includes a troubleshooting scenario that shows how to use some of the tools and concepts from earlier in this chapter, with an opportunity for you to try and discover the problems before the text explains the answers. For those of you following the reading plan using both this book and the CCNA ICND2 Official Exam Certification Guide, note that after this chapter, you should proceed to the ICND2 book and read the chapters in Parts II and III. “Do I Know This Already?” Quiz The “Do I Know This Already?” quiz allows you to assess if 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 15-1 lists the major headings in this chapter and the “Do I Know This Already?” quiz questions covering the material in those headings so you can 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 15-1 Foundation Topics Section Questions IP Troubleshooting Tips and Tools 1–6 A Routing Troubleshooting Scenario 7–9 1828xbook.fm Page 472 Thursday, July 26, 2007 3:10 PM 472 Chapter 15: Troubleshooting IP Routing An internetwork diagram shows a router, R1, with the ip subnet-zero command 1. configured. The engineer has typed several configuration commands into a word processor for later pasting into the router’s configuration. Which of the following IP addresses could not be assigned to the router’s Fa0/0 interface? 172.16.0.200 255.255.255.128 a. 172.16.0.200 255.255.255.0 b. 225.1.1.1 255.255.255.0 c. 10.43.53.63 255.255.255.192 d. Which of the following is a useful command on some Microsoft OSs for discovering a 2. host’s current IP address and mask? tracert a. ipconfig /all b. arp –a c. ipconfig /displaydns d. Examine the following command output. If the user typed the resume command, what 3. would happen? s R1#show sessions Conn Host Address Byte Idle Conn Name 1 Fred 10.1.1.1 0 0 Fred * 2 Barney 10.1.2.1 0 0 Barney The command would be rejected, and the R1 CLI command prompt would be a. displayed again. The CLI user would be connected to a suspended Telnet connection to the router b. with IP address 10.1.1.1. The CLI user would be connected to a suspended Telnet connection to the router c. with IP address 10.1.2.1. The result cannot be accurately predicted from the information shown. d. Refer to the following figure for questions 4–9: Default Gateway Default Gateway 10.1.1.1 172.16.2.4 PC1 PC2 10.1.13.1/30 Fa0/0 Fa0/0 10.1.13.3/30 S0/0 ...