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 - Data Link Layer of OSI Networking Model
• Active Directory : How Objects Are Stored and Identified
• Video - Transport Layer (Layer 4) of OSI Networking Model
• IPv6 Dynamic Address Allocation
• Pv6 Myths
• PoE (Power Over Ethernet)
• Internet Security and VPN Network Design
• TCP/IP Protocol Suite
• IPv6 Payload Length Field and Jumbograms
• A Simple Description of the IPv6 Header and Datagram

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