ccna 200-301 network simulator ns2 serves program

ccna 200-301 network simulator ns2 serves program.K68Brother 3 Early Ethernet*This chapter introduces the development of Ethernet, the keyword segments in Ethernet, the functions and features of MAC (MediaAccessControl, Media Access Control), and the features of the Ethernet physical layer and data link layer.<>3.1 Introduction to EthernetThe Internet Engineering Task Force (IETF) maintains the functionality and services of the upper layers of the TCP/IP protocol, but the functionality and services of the data link and physical layers of the OSI model are described by multiple organizations (IEEE, ANSI, ITU) or designed by private companies (proprietary protocols). The Ethernet standard defines Layer 2 protocols and Layer 1 technologies, and although Ethernet supports different media, bandwidths, the basic frame format and address architecture is the same for all Ethernet.1. IEEE Standards In 1985, the Institute of Electrical and Electronics Engineers (IEEE) Standards Committee developed standards for local area networks (LANs) and metropolitan area networks (MANs). These standards started with 802. The standard for Ethernet was 802.3. IEEE wanted its standards to be compatible with the International Standards Organization (ISO) and the OSI model, and to ensure compatibility, the IEEE 802.3 standard was dedicated to the lower parts of Layer 1 and Layer 2 of the OSI model. As shown in Figure 3-1-1, Ethernet includes the lower two layers of the OSI model, the physical layer and the data link layer, while the IEEE 802.3 standard includes the physical layer and the data link layer of the OSI model.model's physical layer and the lower half of the data link layer (i.e., the MAC sublayer). IEEE802.2 specifies the upper half of the OSI model data link layer (i.e., the LLC layer, Logic LinkControl) ° Ethernet includes both IEEE802.3 and IEEE802.2.2. Ethernet's Data Link Layer Ethernet divides the functions of the Data Link Layer into two sub-layers: LLC (Logical Link Control) and MAC (MediaAccessControl).For Ethernet, the IEEE802.2 standard describes the functions of the LLC sublayer and the IEEEThe IEEE 802.3 standard describes the functions of the MAC sublayer and the physical layer.