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:
• IPv4 Datagram Fields
• The OSI Network Layer
• WAN Network Protocols - DSL, SONET, HDLC, DWDM, DLSW+
• A Simple Description of the IPv6 Header and Datagram
• Kerberos Authentication Protocol
• X.25 and Frame Relay Overview
• Active Directory : How Objects Are Stored and Identified
• IEEE 802 Standards Specify the Basics of Physical and Logical Networking
• IPv6 Flow Label Field
• Network Operating Systems

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