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:
• The OSI Physical Layer
• IP version 6 (IPv6) Advantages and Implementation
• The OSI Reference Model
• Wireless Standards - 802.11a 802.11b 802.11g 802.11n 802.11i Explained
• VTP (VLAN Trunking Protocol)
• Internet Security and VPN Network Design
• Routing Datagrams
• The TCP/IP protocol Datagram Format
• X.25 and Frame Relay Overview
• Pv6 Myths

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