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:
• TCP/IP Protocol Suite
• IPv6 Payload Length Field and Jumbograms
• Unicast, Multicast, Broadcast. What Does It Mean?
• IP version 6 (IPv6) Advantages and Implementation
• Basic TCP/IP Networking
• Internet Security and VPN Network Design
• IPv6 Unicast Addresses
• IPv6 Address Types and Scopes
• IPv6 Flow Label Field
• OSI Transport Layer

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