Ethernet
Dominant wired LAN technology, from 10Mbps to Gbps. Single chip, multiple speeds, simpler, cheap. Sending adapter encapsulates IP datagram in Ethernet frame:
Figure 25 Ethernet frame format
An Ethernet frame has the following fields:
- Preamble: 7 bytes 10101010 followed by one byte 10101011.
- Addresses: 6 byte source, destination MAC addresses
- Type: indicates higher layer protocol (usually IP)
- CRC: cyclic redundancy check. If error detected, frame is dropped
Ethernet is connectionless and unreliable. There are many different Ethernet standards depending on different speeds and physical layer media.
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This resource was developed as part of an Erasmus+ project, funded with support from the European Commission under grant agreement 2016-1-SE01-KA203-22064.
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- The University of Borås, Sweden
- The University of the Highlands and Islands, Scotland
- The University of Alcalá, Spain
- Digital Connections, Scotland
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