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This course provides an introduction to TCP/IP application services.

The course begins by describing the client/server model that is used by the TCP/IP application layer. As you will see, the services provided by the application layer can be divided into three groups: end-user services, support services, and application programming interfaces. The ways to invoke TCP/IP applications on an IBM i system are also discussed.

Next, the course describes two of the most commonly used TCP/IP applications: TELNET and FTP. TELNET is a terminal emulation program. You will see how to use TELNET to sign onto another host, regardless of whether your host and the remote hosts are IBM i servers, System z servers, PCs, or UNIX-based systems. You will also see how to use FTP (the File Transfer Protocol) to transfer files between your system and another host.

Then you will see how the Line Printer Requester (LPR) and Line Printer Deamon (LPD) allow you to route spooled files between systems in a network.

The course ends with a discussion of how IBM i systems can be used as Internet servers.

Approximate Study Time: 2 hours


After completing this course, you should be able to:

  • Describe the method used by TCP/IP to implement typical application services
  • Use the PING (VFYTCPCNN) command to test whether a particular host can be reached from your system
  • Identify the applications that are supported by most TCP/IP implementations
  • Use TELNET to initiate an IBM i session from a remote system
  • Use FTP to transfer files between your system and a remote host
  • Send a spooled file to a remote system for printing
  • Configure an IBM i output queue to route spooled files to a remote system automatically
  • Identify the three protocols that define the World Wide Web
  • Identify the IBM i programs that provide web services

Topic Outline

The Client/Server Model


Using FTP

Remote Printing

The World Wide Web


This course is intended for IBM i professionals who will be installing or using TCP/IP protocols, applications, or related products.


This course assumes that you are familiar with the concepts and basic operations of IBM i systems. This prerequisite can be satisfied by successfully completing the Introduction to the IBM i Environment series. A basic knowledge of data communications is also required.

The course also assumes you have a basic understanding of TCP/IP concepts and facilities. This prerequisite can be satisfied by successfully completing the first course of this series: