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:
• IPv6 Unicast Addresses
• Virtual Local Area Networks (VLANs)
• Basic TCP/IP Networking
• The OSI Data Link Layer
• Kerberos Authentication Protocol
• Comparison of the Layers of the OSI and TCP/IP Models
• Network Cabling and Components
• Internet Protocol versions IPv4, IPv5 and IPv6
• IPv6 Address Types and Scopes
• IP version 6 (IPv6) Advantages and Implementation

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