The access method used in LANs is an Ethernet connection based on the IEEE 802.3 standard. We have different types based on the connection bandwidth (10 Mbps (Ethernet), 100 Mbps (fast Ethernet), or 1,000 Mbps (gigabit Ethernet)). Ethernet gives you the opportunity to choose from different Ethernet-transmission physical devices, such as twisted pair and fiber optics.
The algorithm used to block devices from sending information at the same time is called Carrier Sense Multiple Access/Collision Detect (CSMA/CD). As you can see from the graph shown below two hosts cannot send information at the same time:
In an Ethernet connection, ...
