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:
• WAN Network Protocols - DSL, SONET, HDLC, DWDM, DLSW+
• Wireless Standards - 802.11a 802.11b 802.11g 802.11n 802.11i Explained
• IPv6 Flow Label Field
• What Are Private IP Addresses?
• IEEE 802.11.x Wireless Standards
• Network Switches
• TCP/IP Features
• Video - Data Link Layer of OSI Networking Model
• OSI Network Model
• Comparing IPv4 and IPv6 at a Glance

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