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:
• Comparison of the Layers of the OSI and TCP/IP Models
• How to Set Up FTP (File Transfer Protocol)
• The TCP/IP protocol Datagram Format
• Internet Security and VPN Network Design
• Network Cabling and Components
• Video - Transport Layer (Layer 4) of OSI Networking Model
• Shortest Path Bridging (SPB) Protocol
• Routing Datagrams
• TCP/IP Utilities
• X.25 and Frame Relay Overview

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