Closest’ layer to the user
Works with the applications you use to communicate over the network
E.g.. Services include SMTP, HTTP , DNS; FTP; TFTP; BOOTP; SNMP;RLOGIN; SMTP; NFS; FINGER; TELNET; Clicking on a link on a web page issues a command for the browser to retrieve the relevant information from the Internet
In this example your computer is the source, and the host of the web site information is the destination
The application completes your request and delivers the information to your compute
File Services
Electronic-mail Services
Network-printing Services
Application Services
Database Services
Is the OSI layer that is closest to the user; it provides network services to the user’s applications.
File transfer
Electronic mail
Terminal access
Word processing
Intended communication partners
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