In this chapter, we discuss different flavors of local area networks (LANs). The specific topics to be covered include the following:
The Ethernet is the most widely used LAN technology. The data rates of the most popular versions of Ethernet are as follows:
An Ethernet LAN may use coaxial cable, special grades of twisted pair wiring, or fiber optic cable. “Bus” and “Star” wiring configurations are supported. Ethernet devices compete for access to the network using the carrier sense multiple access with collision detection (CSMA/CD) protocol. Ethernet LANs are defined in the IEEE 802.3 standards. The IEEE 802.3 LAN network architecture follows the hierarchical model, as shown in Figure 5.1. The MAC client sublayer is called the logical link control (LLC) when an end system, such as PC, is transmitting data. It is called the bridge entity when it is used for LAN-to-LAN interconnection.
Figure 5.2 illustrates the format of an Ethernet frame, which is similar to the IEEE 802.3 LAN frame. In the remainder of this chapter, we use the term ...