The OSI Application Layer
By Stephen Bucaro
The Application layer, layer seven of the OSI model, provides the interface between
applications and the Network Operating System (NOS). The Application layer provides
network services and applications such as HTTP (Hypertext Transfer Protocol), FTP (File
Transfer Protocol), TELNET, SNMP (Simple Netwrok Management Protocol) and SMTP (Simple
Mail Transport Protocol).
![OSI Application Layer OSI Application Layer](../images/layer7.gif)
When you think of the Application layer, don't think in terms of applications, but
rather protocols. For example there are several different FTP applications that use
the FTP protocol at the Application layer.
More Networking Protocols and Standards: • Video - Data Link Layer of OSI Networking Model • 14 Common Network Ports You Should Know • Video Streaming Protocols • The OSI Application Layer • An Introduction to the Types of VPNs • Network Switches • Integration of IPv6 with IPv4 • TCP/IP Features • SYN-ACK Handshake to Establish a TCP Connection • IGRP (Interior Gateway Routing Protocol)
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