What is computer Ethernet

Computer Ethernet is a baseband LAN technology developed in the 1970s. It uses coaxial cables as network media, adopts carrier multiple access and conflict detection mechanisms, and has a data transmission rate of 10MBPS.

Ethernet is a baseband LAN technology developed in the 1970s. It uses coaxial cables as network media and adopts Carrier multiple access and collision detection (CSMA/CD) mechanism, data transmission rate reaches 10MBPS.

But nowadays Ethernet is more commonly used to refer to various local area networks using CSMA/CD technology. The frame format of Ethernet is consistent with IP and is particularly suitable for transmitting IP data. Ethernet is simple and convenient, low in price, and high in speed.

Previously the physics community believed that there was an extremely sparse medium in the universe and called it ether, but later experiments proved that there was no so-called ether, because the word was a product of that time, just like many of our previous Unscientific naming was caused before people discovered it. Although it was later proven to be incorrect, the name was passed down for commemoration or other reasons.

Extension information

The original Ethernet used coaxial cables to connect various devices. The computer connects to the cable through a transceiver called the Attachment Unit Interface (AUI).

A simple network cable is still very reliable for a small network. For a large network, a fault in a certain line or a fault in a connector will cause one or more Ethernet networks to fail. segment instability.

Because all communication signals are transmitted on shared lines, messages sent by one computer will be received by all other computers, even if the information is only sent to one of the terminals (destination).

Under normal circumstances, the network interface card will filter out information that is not sent to itself, and will only send an interrupt request to the CPU when receiving information whose target address is its own, unless the network card is in promiscuous mode.

This "one speaks, everyone listens" characteristic is a security weakness of shared-medium Ethernet, because a node on the Ethernet can choose whether to monitor all information transmitted on the line. Sharing the cable also means sharing the bandwidth, so Ethernet can be very slow in some situations, such as after a power failure when all network terminals are rebooted.

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