<Li> ITU - T G.hn PHY </Li> <Li> RS - 232 </Li> <Li> RS - 449 </Li> <Tr> <Td> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> </Td> </Tr>

Http imap4 ftp and telnet are all examples of protocols that operate at what layer of the osi model