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The OSI Application Layer

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).

OSI Application Layer

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:
• Video - Introducing the OSI Model
• DSL (Digital Subscriber Line)
• IPv4 Datagram Fields
• Video - Network Layer (Layer 3) of OSI Networking Model
• Ports and Sockets
• Network Gateways
• Free eBook: IPv6 Addressing
• NTP Server Systems - The Network Time Protocol
• Internet Security and VPN Network Design
• SYN-ACK Handshake to Establish a TCP Connection

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