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:
• VTP (VLAN Trunking Protocol)
• Session Border Controllers - More Than Just a Voice Firewall
• NTP Server Systems - The Network Time Protocol
• Dynamic Host Configuration Protocol (DHCP) Explained
• A Simple Description of the IPv6 Header and Datagram
• IPv4 Datagram Fields
• OSI Network Model
• Network Cabling and Components
• What Are Private IP Addresses?
• IPv6 Anycast Addresses

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