What is Ethernet evolution in computer networks?

Ethernet was developed at Xerox PARC between 1973 and 1974. Engineer Bob Metcalfe invented it for interconnecting advanced computer workstations, making it possible to send data to one another and to high-speed laser printers.

It was originally intended to create a network in a small area known as a Local Area Network (LAN). Ethernet has since evolved to become the dominant wired networking technology worldwide.

Ethernet Evolution Timeline

• 1983 − The first iteration of Ethernet 10Base-5 was released, operating at 10 Mbps using thick coaxial cable.

• 1985 − Thin coaxial cable (10Base-2) was approved, with specification updates in 1987, 1990, and 1993.

• 1995 − Fast Ethernet (100Base-T) was introduced, operating at 100 Mbps with full-duplex capability (simultaneous bidirectional transmission).

• 1998 − Gigabit Ethernet (1000Base-X) reached 1 Gbps using fiber optics. IEEE approved 1 Gbps over twisted pair (1000Base-T) one year later.

• 2002 − 10 Gigabit Ethernet hit the 10 Gbps milestone for fiber transmission, with 10 Gbps over unshielded twisted pairs becoming reality in 2006.

Types of Ethernet

Ethernet technologies are categorized into two main types:

• Standard Ethernet − Also called classical Ethernet, includes the original 10 Mbps implementations using shared media.

• Switched Ethernet − Includes Fast Ethernet (100 Mbps), Gigabit Ethernet (1 Gbps), and 10 Gigabit Ethernet, using dedicated switched connections.

How Ethernet Works

Ethernet operates across two layers of the OSI model. It is implemented in the lower half of the Data Link Layer (called the Medium Access Control or MAC sublayer) and the Physical Layer.

At the Physical Layer, Ethernet involves signals and bit streams that travel on the media, physical components that put signals on media, and various network topologies. The basic design principle allows multiple computers to access the shared medium and send data at any time using CSMA/CD (Carrier Sense Multiple Access with Collision Detection) in traditional Ethernet.

Advantages of Ethernet

• Cost-effective − Inexpensive hardware and widespread adoption keep costs low

• Easy to use − Simple installation and configuration with plug-and-play capability

• Scalable and flexible − Supports various speeds and can grow with network requirements

• Industry standard − Universal compatibility across vendors and devices

Conclusion

Ethernet has evolved from a 10 Mbps shared-medium technology to high-speed switched networks reaching 10+ Gbps. Its continuous evolution, cost-effectiveness, and industry-standard status make it the dominant wired networking technology for LANs worldwide.