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IEEE802.3是一个工作组，也表示此工作组制定的一系列IEEE标准，这些标准都是物理层和数据链路层（MAC）的有线以太网标准（802.11是WiFi）。一般情况下，以太网就是一个局域网络，带有广域网的一些功能应用。物理连接存在与节点之前，或者节点与网络设备之间，比如hub,switch,router.连接形式多种多样，有各种的铜线和光纤。802.3技术支持802.1网络，802.3也定义了局域网的连接机制是CSMA/CD。
IEEE 802.3 is a working group and a collection of IEEE standardsproduced by the working group defining the physical layer and datalink layer's media access control (MAC) of wired Ethernet. This isgenerally a local area network technology with some wide areanetwork applications. Physical connections are made between nodesand/or infrastructure devices (hubs, switches, routers) by varioustypes of copper or fiber cable. 802.3 is a technology that supportsthe IEEE 802.1network architecture. 802.3 also defines LAN accessmethod using CSMA/CD.
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