Chapter 9 - Local area networks part I: Basic concepts and Wired Ethernet LANs. In this chapter, we discuss how the first two layers of the OSI model (physical and data link) are used to implement local area networks (LANs). In this chapter, we discuss the basics of LANs and Ethernet, the dominant LAN technology. | Chapter 9 Local Area Networks Part I: Basic Concepts and Wired Ethernet LANs Understand the use of LANs in an organization. List the components of a LAN. Be familiar with the IEEE standards. Be familiar with traditional Ethernet technology and its implementations. After reading this chapter, the reader should be able to: OBJECTIVES Be familiar with Gigabit Ethernet technology and its implementations. Be familiar with Fast Ethernet technology and its implementations. BASIC CONCEPTS Figure 9-1 A client-server model with dedicated servers Figure 9-2 A client-server model with a general server Figure 9-3 Peer-to-peer model Figure 9-4 Physical bus topology Figure 9-5 Physical star topology The star topology is the dominant physical topology today. Note: Figure 9-6 Logical bus topology In 1985, the Computer Society of the IEEE developed Project 802. It covers the first two layers of the Internet model. Note: Figure 9-7 Logical star topology Technical Focus: Ring Topology Another . | Chapter 9 Local Area Networks Part I: Basic Concepts and Wired Ethernet LANs Understand the use of LANs in an organization. List the components of a LAN. Be familiar with the IEEE standards. Be familiar with traditional Ethernet technology and its implementations. After reading this chapter, the reader should be able to: OBJECTIVES Be familiar with Gigabit Ethernet technology and its implementations. Be familiar with Fast Ethernet technology and its implementations. BASIC CONCEPTS Figure 9-1 A client-server model with dedicated servers Figure 9-2 A client-server model with a general server Figure 9-3 Peer-to-peer model Figure 9-4 Physical bus topology Figure 9-5 Physical star topology The star topology is the dominant physical topology today. Note: Figure 9-6 Logical bus topology In 1985, the Computer Society of the IEEE developed Project 802. It covers the first two layers of the Internet model. Note: Figure 9-7 Logical star topology Technical Focus: Ring Topology Another physical topology common at the beginning of the LAN era was the ring topology. In a ring topology, each station is connected to the next station as shown in the following figure: Project 802 has split the data link layer into two different sublayers: logical link control (LLC) and media access control (MAC). Note: Figure 9-8 LAN compared with the Internet model WIRED ETHERNET LANs Figure 9-9 Collision in CSMA/CD Technical Focus: Ethernet Addressing Each station on an Ethernet network (such as a PC, workstation, or printer) has its own network interface card (NIC). The NIC usually fits inside the station and provides the station with a 6-byte (48-bit) physical address. Technical Focus: Signaling Traditional Ethernet uses Manchester digital encoding (discussed in Chapter 6). In this type of signaling, the transition at the middle of each bit is used for synchronization between the sender and receiver. Figure 9-10 Implementations of Ethernet Figure 9-11:a Ethernet connection to the .
