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:
• IPv4 Datagram Fields
• TCP Windowing
• Video - The Upper Layers 5 Through 7 of the OSI Networking Model
• Network Operating Systems
• Video - Transport Layer (Layer 4) of OSI Networking Model
• IP Addressing and Subnetting
• OSI Transport Layer
• How to Set Up FTP (File Transfer Protocol)
• What Are Private IP Addresses?
• Dynamic Host Configuration Protocol (DHCP) Explained

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