1 | (5) Session: handles coordination between processes; concentrates on network management, password recognition, logon and logoff procedures, network monitoring; SNMP, FTP, SMTP, Telnet |
2 | (6) Presentation: provides data formatting and code conversion, network security and file transfers; AFP |
3 | (7) Application: provides user interface to lower level; X.400, X.500, FTAM |