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:
• TCP Windowing
• Dynamic Host Configuration Protocol (DHCP) Explained
• Shortest Path Bridging (SPB) Protocol
• Routing Information Protocol (RIP), Open Shortest Path First (OSPF), and Routing Convergence
• Internet Security and VPN Network Design
• Network Routing Protocols - IGRP, EIGRP, OSPF, ISIS, BGP
• IEEE 802.11.x Wireless Standards
• The OSI Presentation Layer
• The OSI Reference Model
• SYN-ACK Handshake to Establish a TCP Connection

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