CISCO Exploration 1 (chapter 9)

          The chapter 9 in cisco exploration 1 talks about the Ethernet, how it evolve , its functions, how it connects, how it communicate and how it works in the society nowadays. Upon reading the title of this chapter in Cisco exploration 1 I have some questions build in my mind like What is Ethernet? Does Ethernet and Internet the same or not? If not , how they differ to each other? so in order to answer all my question I read the chapter.

What is Ethernet?

            Ethernet is a family of computer networking technologies for local area networks (LANs) commercially introduced in 1980 by a consortium of Digital Equipment Corporation, Intel, and Xerox (DIX). It is also Standardized in Institute of Electrical and Electronics Engineers (IEEE) 802.3 which defines several wiring and signaling  and it has largely replaced competing wired LAN technologies. Systems communicating over Ethernet divide a stream of data into individual packets called frames who contains source and destination address and it has also an error-checking data so that damaged data can be detected and re-transmitted. Ethernet uses a bus or star topology and supports data transfer rates of 10 Mbps.

Functions, Evolution and Others

            Ethernet function by means of first two layers in the OSI Model which is the Physical Layer and the Data Link Layer. In Physical Layer it defines the means of transmitting raw bits rather than logical data packets over a physical link connecting network nodes. In the data link layer it covers the two sublayers of the datalink layer the Media Access Control Sublayer and the Logical Link Control Layer. In MAC Sub layer, it works on the physical components which is useful for computer communications  and it has an  IEEE 802.3 standard.  The LLC Sublayer of the data link layer creates a connection with the upper layers and and contribute significantly to technological compatibility in the computer, it also has an IEEE 802.2 standard.  Ethernet also uses the Carrier Sense Multiple Access with Collision Detection (CSMA/CD) access method to handle simultaneous demands and it is one of the most widely implemented LAN standards. Base in exploration 1 CSMA/CD is the first known Ethernet. CSMA/CD is a Media Access Control (MAC) protocol in which a node verifies the absence of other traffic before transmitting on a shared transmission medium, such as an electrical bus, or a band of the electromagnetic spectrum. How it works? Carrier sense has a transmitter that uses feedback from a receiver that detects a carrier wave before trying to send and it tries to detect the presence of an encoded signal from another station before attempting to transmit. If a carrier is sensed, the station waits for the transmission in progress to finish before initiating its own transmission while in Multiple Access it describes the fact that multiple stations send and receive on the medium and transmissions by one node are generally received by all other stations using the medium.

Does Ethernet and Internet the same or not? How they differ?

            This is one of the questions built in my mind when I see the word Ethernet in chapter 9 of exploration 1 before reading it as a whole that is why I searched the answer and I want to share it to everyone.

ETHERNET: LAN [local area network] - it connects your computer to computers close by and around you

INTERNET : WAN [wide area network] - basically, this is the internet as you know it. It connects your computer to computers around the world

ethernet is almost always faster than internet
and ethernet can be connected to an internet, sometimes making things confusing

just remember: ethernet = close
                       internet = worldwide