Introduction To TCP/IP Model ( DOD Model)-The Application/Process Layer Protocols
As we know the Application , presentation and session layer of OSI in together corresponds to the Process or Application layer of TCP/IP model. The various protocols that are associated with Process layer are DNS,SNMP,telnet ,ftp,tftp,nfs etc and the list goes . I am going to explain a few . You may need to have them running on your system when you later advance in your expertise skills in networking as they are useful.