What is Ethernet?

What is Ethernet?

Ethernet so, its defines how data is sent and received between devices.And it's become most widely use standard in internet.

In past Token Ring and FDDI are used when Ethernet is not in the world.

This Ethernet standard governance by Electrical and Electronics Engineers (IEEE) and its referred to 802.3.

What are frames?

Devices on Ethernet networks transmit frames and it contains physical address information that helps switches determine where to send data.

But switches actually don't send data using IP address, they navigate data using mac-addresses or physical addresses.   

IEEE 802.3

IEEE 802.3 defines something called carrier sense multiple access with collision detection commonly see this refer to CSMA / CD .

So what happen in CSMA/CD that devices share connection if they send data at the same time,collisions occur . 

As a example if you driving in a one lane road, you drive your car to and other one come forward to you  so you get crash.

It also happens to the data so you have  two electrical pulses running to each other and also data get corrupted and nobody get data.

So it means only one computer can transmit at a time.

What is the process of CSMD/CD ?

1. Assemble a frame
2. Check if the medium is free

• If it free, transmit a bit of a frame.
• If not, don't transmit and repeat step 2

1. Check if a collision was detected 

• If so, implements the collision detected procedure.
• If not, transmit the remaining bits in the frame.