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:
• Dynamic Host Configuration Protocol (DHCP) Explained
• Network Gateways
• TCP/IP Features
• Integration of IPv6 with IPv4
• IP Addressing and Subnetting
• Comparing IPv4 and IPv6 at a Glance
• Session Border Controllers - More Than Just a Voice Firewall
• OSPF (Open Shortest Path First) Protocol
• Kerberos Authentication Protocol
• IPv6 Anycast Addresses

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