CCENT/CCNA ICND1 Official Exam Certification Guide - Chapter 6

Fundamentals of TCP/IP Transport, Applications, and Security Các kỳ thi CCNA tập trung chủ yếu vào một cuộc kiểm tra sâu hơn và rộng hơn về các chủ đề trong Chương 3 (mạng LAN), Chương 4 (WAN), và Chương 5 (định tuyến). Chương này giải thích những điều cơ bản của một chủ đề nhận được sự chú ý ít hơn vào các kỳ thi: TCP / IP vận chuyển lớp, giao thức TCP / IP lớp ứng dụng, và TCP / IP an ninh mạng. Mặc dù cả ba chủ đề được bảo hiểm về kỳ thi CCNA...
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CCENT/CCNA ICND1 Official Exam Certification Guide - Chapter 6 1828xbook.fm Page 129 Thursday, July 26, 2007 3:10 PM 6 CHAPTER Fundamentals of TCP/IP Transport, Applications, and Security The CCNA exams focus mostly on a deeper and broader examination of the topics covered in Chapter 3 (LANs), Chapter 4 (WANs), and Chapter 5 (routing). This chapter explains the basics of a few topics that receive less attention on the exams: the TCP/IP transport layer, the TCP/IP application layer, and TCP/IP network security. Although all three topics are covered on the various CCNA exams, the extent of that coverage is much less compared to LANs, WANs, and routing. “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 ten self-assessment questions, you might want to move ahead to the “Exam Preparation Tasks” section. Table 6-1 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 6-1 Foundation Topics Section Questions TCP/IP Layer 4 Protocols: TCP and UDP 1–6 TCP/IP Applications 7, 8 Network Security 9, 10 PC1 is using TCP and has a window size of 4000. PC1 sends four segments to PC2 1. with 1000 bytes of data each, with sequence numbers 2000, 3000, 4000, and 5000. PC2 replies with an acknowledgment number of 5000. What should PC1 do next? Increase its window to 5000 or more segments a. Send the next segment, with sequence number 6000 b. Resend the segment whose sequence number was 5000 c. Resend all four previously sent segments d. 1828xbook.fm Page 130 Thursday, July 26, 2007 3:10 PM 130 Chapter 6: Fundamentals of TCP/IP Transport, Applications, and Security Which of the following are not features of a protocol that is considered to match OSI 2. Layer 4? Error recovery a. Flow control b. Segmenting of application data c. Conversion from binary to ASCII d. Which of the following header fields identify which TCP/IP application gets data 3. received by the computer? Ethernet Type a. SNAP Protocol Type b. IP Protocol Field c. TCP Port Number d. UDP Port Number e. Application ID f. Which of the following are not typical functions of TCP? 4. Windowing a. Error recovery b. Multiplexing using port numbers c. Routing d. Encryption e. Ordered data transfer f. Which of the following functions is performed by both TCP and UDP? 5. Windowing a. Error recovery b. Multiplexing using port numbers c. Routing d. Encryption e. Ordered data transfer f. 1828xbook.fm Page 131 Thursday, July 26, 2007 3:10 PM “Do I Know This Already?” Quiz 131 What do you call data that includes the Layer 4 protocol header, and data given to 6. Layer 4 by the upper layers, not including any headers and trailers from Layers 1 to 3? ...