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:
• IP Addressing
• Kerberos Authentication Protocol
• What's the Difference Between a Packet and a Frame?
• Networking Protocols, Ports, Standards, and Organizations What Does it All Mean?
• Video - Network Layer (Layer 3) of OSI Networking Model
• Internet Security and VPN Network Design
• A Simple Description of the IPv6 Header and Datagram
• Video - Introducing the OSI Model
• IPv4 Datagram Fields
• Evolution of the Microsoft NOS (Active Directory)