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Application Protocols
Application protocols are the highest-level protocols within the application layer. The
application layer overall consists of several independent protocols that put into
effect commonly used applications.
These protocols are able to communicate with applications on the same host or on
different hosts. They serve as the user-visible interface to the TCP/IP protocol suite
and use UDP and TCP protocols as methods for data transmission. Some of the
most frequently used application protocols include FTP, SMTP, and TELNET.
Application Protocol Standards
The TCP/IP protocols include standards for many common applications. A
discussion of each follows.
File Transfer Protocol (FTP)
FTP is an AS/400 TCP/IP application that enables you to transfer files between
local and remote hosts. It does this through the use of the FTP subcommands, GET
and PUT. FTP transfers files by using either an ASCII or EBCDIC mode. ASCII
mode transfers data sets that contain only text characters.
Remote Printing (Line Printer Requester and Line Printer
Daemon)
AS/400 TCP/IP provides client support and server support for remote printing. The
client, line printer requester (LPR), allows the user to send spooled files to a remote
system that is running a remote printer daemon (LPD) server.
Bootstrap Protocol (BOOTP)
BOOTP is a TCP/IP protocol that allows for booting systems remotely to the
network. BOOTP is used to support the IBM Network Station for AS/400.
Trivial File Transfer Protocol (TFTP)
Trivial File Transfer Protocol (TFTP) is a simple protocol and is used solely to
provide basic file transfers to and from a remote server. TFTP is used to support
the IBM Network Station for AS/400.
Route Daemon (RouteD) Server
The Route Daemon provides support for the Routing Information Protocol (RIP) on
AS/400. RIP is the most widely used routing protocol today. RIP is an Internet
Gateway Protocol used to assist TCP/IP in the routing of IP data packets.
Remote Execution (REXEC) Server
The Remote Execution server allows a client user to submit system commands to a
remote server system.
Simple Mail Transfer Protocol (SMTP)
AS/400 TCP/IP provides for the exchange of electronic mail between host servers
running TCP/IP by using SMTP. The SMTP application is based on end-to-end
delivery, which means that an SMTP client contacts the destination host’s SMTP
Chapter 1. TCP/IP on AS/400 13