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:
• WAN Network Protocols - DSL, SONET, HDLC, DWDM, DLSW+
• IPv4 Address Classes
• Networking Routing Believability and Administrative Distance
• IP version 6 (IPv6) Advantages and Implementation
• What's the Difference Between a Packet and a Frame?
• Network Operating Systems
• X.25 and Frame Relay Overview
• T-Carrier
• IPv6 Address Auto Configuration
• Shortest Path Bridging (SPB) Protocol

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