<Li> UNI / O </Li> <Li> 1 - Wire </Li> <Li> and most forms of serial communication . </Li> <P> In the Internet Protocol Suite (TCP / IP), OSI's data link layer functionality is contained within its lowest layer, the link layer . The TCP / IP link layer has the operating scope of the link a host is connected to, and only concerns itself with hardware issues to the point of obtaining hardware (MAC) addresses for locating hosts on the link and transmitting data frames onto the link . The link layer functionality was described in RFC 1122 and is defined differently than the Data Link Layer of OSI, and encompasses all methods that affect the local link . </P>

Which functions can take place at the data-link layer of the osi model