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:
• IPv4 Address Classes
• Evolution of the Microsoft NOS (Active Directory)
• Routing Datagrams
• Understanding IP Routing
• Networking and Internet Standards Organizations
• SYN-ACK Handshake to Establish a TCP Connection
• Kerberos Authentication Protocol
• Unicast, Multicast, Broadcast. What Does It Mean?
• IPv6 Flow Label Field
• IPv6 Multicast Addresses

RSS Feed

 Follow @Stephen Bucaro

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