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:
• The OSI Data Link Layer
• Network Operating Systems
• Looking at the OSI 7 Layer Reference Model
• NTP Server Systems - The Network Time Protocol
• Shortest Path Bridging (SPB) Protocol
• Classless IP Addressing
• Session Border Controllers - More Than Just a Voice Firewall
• Free eBook: IPv6 Addressing
• What's the Difference Between a Packet and a Frame?
• The OSI Network Layer

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