What are the four transmission media of traditional Ethernet?

* * * Enjoy media: All network devices use the same communication media in turn.

Broadcast domain: The frame to be transmitted is sent to all nodes, but only the addressed nodes will receive the frame.

CSMA/CD: Carrier Sense Multiple Access/Collision Detection Method in Ethernet

Detection) to prevent twp or more nodes from transmitting at the same time.

MAC address: All Ethernet in the media access control layer.

Network interface cards (NICs) all use 48-bit network addresses. This address is unique in the world.

Ethernet refers to the baseband LAN specification created by Xerox, which was jointly developed by Xerox, Intel and DEC. It is the most common communication protocol standard adopted by local area networks. Ethernet uses CSMA/CD (Carrier Sense Multiple Access and Collision Detection) technology and runs at the rate of 10m/s on various types of cables. Ethernet is similar to IEEE802 3 series standards. It is not a specific network, but a technical specification.

Ethernet basic network composition:

* * * Enjoy media and cables: 10base (twisted pair), 10Base-2 (thin coaxial cable) and 10Base-5 (thick coaxial cable).

Repeater or hub: A hub or repeater is a device used to receive a large number of Ethernet connections on network devices. The data obtained by the connected receiving side is reused and sent to all connected devices on the transmitting side to obtain transmission-type devices.

Bridge: The bridge belongs to the second layer equipment, which is responsible for dividing the network into independent conflict domains and obtaining network segments, so as to achieve the purpose of maintaining broadcasting and * * * enjoyment in the same domain/network segment. The bridge includes a table covering all network segments and forwarding frames to ensure normal communication behavior within and around the network segment.

Switches: Switches, like bridges, belong to Layer 2 devices and are multi-port devices. A switch supports functions similar to those of a bridge, but it has advantages over a bridge because it can temporarily connect any two ports together. The switch includes a switching matrix through which ports can be quickly connected or disconnected. Unlike hubs, switches only forward frames from one port to other connected target nodes, and do not include broadcast ports.

Ethernet protocol: The frame structure of Ethernet is provided in IEEE 802.3 standard. At present, Ethernet supports four transmission rates supported by optical fiber and twisted pair media:

10

Mbps–10base-t Ethernet (802.3)

100 Mbps–Fast Ethernet (802.3u)

1000 Mbps–Gigabit Ethernet (802.3z))

10 gigabit Ethernet–IEEE 802.3ae