Chapter 9 Ethernet

Chapter 9 Ethernet

               

In this chapter it explains about how the Ethernet evolve from the topology where its physical is from bus to star. And the first Ethernet was developed in 1980 by a consortium of Digital Equipment Corporation, Intel, and Xerox (DIX). The foundation for Ethernet technology was first established in 1970 with a program called Alohanet.  Alohanet was a digital radio network designed to transmit information over a shared radio frequency between the Hawaiian Islands. The first version of Ethernet incorporated a media access method known as Carrier Sense Multiple Access with Collision Detection (CSMA/CD). Ethernet is a predominant it can found in the datalink and physical layer of the OSI model. Data link has two sub layer the LLC or Logic Link Control and it has an IEEE standard of 802.2 and the second sublayer of the datalink is the MAC or Media Access Control that has a standard of 802.3. . The Data Link sublayers contribute significantly to technological compatibility and computer communications. The MAC sublayer is concerned with the physical components that will be used to communicate the information and prepares the data for transmission over the media. UTP patch panels in a rack, Ethernet switches, Ethernet fiber connectors, and the Ethernet switch are the Physical devices that are used in Ethernet. It was also discuss here the migration of Ethernet in using switches as a replace from hub to perform the task faster and it start the introduction of full duplex. The Ethernet Timing or the Delay and latency of Ethernet were also discussed here from sending to receiving of data. An Ethernet frame takes a measurerable time to travel (TTL) from the sending device to their receiver. Each intermediary device contributes on the overall latency.  CSMA/CD controls access to the shared media. If there is a collision, it is detected and frames are retransmitted.