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:
• A Simple Description of the IPv6 Header and Datagram
• OSI Transport Layer
• Video - Transport Layer (Layer 4) of OSI Networking Model
• Networking and Internet Standards Organizations
• An Introduction to the Types of VPNs
• Unicast, Multicast, Broadcast. What Does It Mean?
• Internet Protocol versions IPv4, IPv5 and IPv6
• IPv4 Datagram Fields
• IP version 6 (IPv6) Advantages and Implementation
• WAN Network Protocols - DSL, SONET, HDLC, DWDM, DLSW+

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