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).

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 - Transport Layer (Layer 4) of OSI Networking Model • IPv6 Address Auto Configuration • Networking Protocols, Ports, Standards, and Organizations What Does it All Mean? • Routing Datagrams • IPv4 Address Classes • RADIUS Protocol • IPv6 Packet Fragmentation • Integration of IPv6 with IPv4 • IPv6 Address Types and Scopes • Network Operating Systems
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