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:
• IPv6 Payload Length Field and Jumbograms
• IP Addressing and Subnetting
• Networking Protocols, Ports, Standards, and Organizations What Does it All Mean?
• Protocol Suites
• Introducing OpenStack
• What Is Fabric Networking?
• Free eBook: IPv6 Addressing
• Video - Transport Layer (Layer 4) of OSI Networking Model
• PoE (Power Over Ethernet)
• The OSI Physical Layer

RSS Feed

 Follow @Stephen Bucaro

 Basics and Certification
 Technologies and Media
 Protocols and Standards
 Troubleshooting and Support
 Network Security
 Cisco Certification