Data Link Layer Fundamentals: Ethernet LANs Như bạn đã học trong chương trước, OSI Layers 1 và bản đồ 2 chặt chẽ với các lớp giao diện mạng TCP / IP. Trong chương này, bạn sẽ tìm hiểu chi tiết hơn về các chức năng của hai lớp thấp nhất trong mô hình tham chiếu OSI, với phạm vi bảo hiểm cụ thể của Ethernet mạng cục bộ (mạng LAN). Giới thiệu về cuốn sách này đề cập rằng các kỳ thi INTRO bao gồm một số chủ đề nhẹ nhàng và bao gồm những người khác đến độ. | C H A P T E R Data Link Layer Fundamentals Ethernet LANs As you learned in the previous chapter OSI Layers 1 and 2 map closely to the network interface layer of TCP IP. In this chapter you will learn more details about the functions of each of the two lowest layers in the OSI reference model with specific coverage of Ethernet local-area networks LANs . The introduction to this book mentioned that the INTRO exam covers some topics lightly and covers others to great depth. As implied in the title this chapter hits the fundamentals of Ethernet paving the way for deeper coverage of other topics later in the book. Chapter 9 Cisco LAN Switching Basics and Chapter 10 Virtual LANs and Trunking delve into a much deeper examination of LAN switches and virtual LANs. Chapter 11 LAN Cabling Standards and Topologies increases your breadth of knowledge about Ethernet including a lot of broad details about Ethernet standards cabling and topologies all of which can be on the exam. Do I Know This Already Quiz The purpose of the Do I Know This Already quiz is to help you decide whether you really need to read the entire chapter. If you already intend to read the entire chapter you do not necessarily need to answer these questions now. The ten-question quiz derived from the major sections in Foundation Topics portion of the chapter helps you determine how to spend your limited study time. Table 3-1 outlines the major topics discussed in this chapter and the Do I Know This Already quiz questions that correspond to those topics. Table 3-1 Do I Know This Already Foundation Topics Section-to-Question Mapping Foundations Topics Section Questions Covered in This Section OSI Perspectives on Local-Area Networks 1 5 Early Ethernet Standards 3 7 8 Ethernet Data Link Protocols 2 4 6 9 Recent Ethernet Standards 10 44 Chapter 3 Data Link Layer Fundamentals Ethernet LANs CAUTION The goal of self-assessment is to gauge your mastery of the topics in this chapter. If you do not know the answer to a .
