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:
• IGRP (Interior Gateway Routing Protocol)
• How to Set Up FTP (File Transfer Protocol)
• Network Cabling and Components
• IPv6 Prefix Length Notation
• The OSI Session Layer
• IEEE 802.11 Wireless Modulation Methods
• VTP (VLAN Trunking Protocol)
• Networking and Internet Standards Organizations
• A Simple Description of the IPv6 Header and Datagram
• The OSI Application Layer

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