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:
• DSL (Digital Subscriber Line)
• The TCP/IP protocol Datagram Format
• VTP (VLAN Trunking Protocol)
• What Are Private IP Addresses?
• IP version 6 (IPv6) Advantages and Implementation
• Routing Datagrams
• Active Directory : How Objects Are Stored and Identified
• IPv6 Dynamic Address Allocation
• TCP Windowing
• IPv6 Anycast Addresses

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