Chapter 6: Application Layer

• What is an application layer?
• Layer 7
• Works closest to the user and provides file transmissions, message exchanges, terminal sessions etc.
• Does not include actual application
• Includes protocols that support the applications
• What does the application layer do?
• Processes and properly formats the data and passes the same data down to the next layer within the OSI model (Open Systems Interconnection Reference Model).
• Examples of protocols working at this layer:
• Simple Mail Transfer Protocol (SMTP)
• Hypertext Transfer Protocol (HTTP)
• Line Printer Daemon (LPD)
• File Transfer Protocol (FTP)
• Telent
• Trivial File Transfer Protocol (TFTP)