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:
• Unicast, Multicast, Broadcast. What Does It Mean?
• T-Carrier - A Complete and Comprehensive Guide
• A Simple Description of the IPv6 Header and Datagram
• IEEE 802 Standards Specify the Basics of Physical and Logical Networking
• IP Addressing and Subnetting
• Video - Data Link Layer of OSI Networking Model
• TCP/IP Protocol Suite
• Looking at the OSI 7 Layer Reference Model
• WAN Network Protocols - DSL, SONET, HDLC, DWDM, DLSW+
• The OSI Network Layer

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