Before using any RPM packages, you must know where to find them. An Internet search returns many RPM repositories, but if you are looking for RPM packages built by Red Hat, they can be found at the following locations:
The Red Hat Enterprise Linux CD-ROMs
The Red Hat Errata Page available at http://www.redhat.com/apps/support/errata/
Red Hat Network — Refer to Chapter 12, Red Hat Network for more details on Red Hat Network.