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:
• Network Gateways
• What is PPP, PPPoA and PPPoE?
• Routing Information Protocol (RIP), Open Shortest Path First (OSPF), and Routing Convergence
• Shortest Path Bridging (SPB) Protocol
• OSI Transport Layer
• Link Aggregation
• Network Operating Systems
• A Simple Description of the IPv6 Header and Datagram
• What Are Private IP Addresses?
• Networking Protocols, Ports, Standards, and Organizations What Does it All Mean?

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