The intended audience of this paper is anyone planning to network low-level embedded systems. The organization and presentation of this paper are oriented toward industrial environments; however, the key points translate easily for commercial use as well. The sequence of this paper is a section on definition of terms; evaluation metrics used descriptions; miscellaneous serial bus, Bluetooth, LonWorks, Ethernet, and wireless Ethernet networking technologies descriptions; a summary of how these technologies compare; and a list of resources for further information.