Ethernet Frame Essay

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Q1.Ethernet has become the standard for LAN communications. Give a brief overview of structure of an Ethernet frame.
Ethernet and Wi-Fi are the most commonly used technologies to set up Local Area Networks today. It operates by using Carrier Sense Multiple Access Detection (CSMA/CD) to control media access. (Study CCNA, 2016)
The structure of an Ethernet Frame is as follows:

The Ethernet Frame Structure (Anon., 2013) Explanation:
• Preamble: This field is responsible for harmonizing bits between the sending and receiving system. It consists usually of 7 bytes.
• Start Frame Delimiter (SFD): is used as a space breaker that signifies and that the next byte marks the beginning of the destination Mac Address field. Together with the Preamble
…show more content…
New ways to communicate: Light Fidelity (Li-Fi) Communications
Li-Fi is a type of Visible Light Communications (VLC) system that coordinates immensely high speed wireless communications by using light (Mercer, 2017) It functions by using common Light Emitting Diodes (LED) to facilitate data transfer at speeds up to 224 gigabits per second (Mercer, 2017). Li-Fi proposes a world where common sources of light are able to connect us to the internet.
The term Li-Fi was invented by Harold Haas, a University of Edinburgh Professor in 2011. He foresees light bulbs acting as wireless routers and later went on to set up a company, pureLiFi with the goal of becoming an authority in VLC (Mercer, 2017).
How it works:
Li-Fi permits data transmission by regulating the intensity of a light source to be received by a photo-sensitive sensor. The light signal is then modified into electric form and this process is not discernible to the human eye (pureLiFi, 2017). For instance, data is imputed into a LED bulb and sent at fast speeds to the photo-sensor. The receiver then converts the variations in the dimming of the LED bulb into electric signals. Finally, these signals are converted into a data stream of 1s and 0s that the applications running on our internet-enabled devices can understand (Mercer,

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