The source DVD and SRPM packages are required by the GNU GPL license and you do not need them to install the OS.
The boot CD contains only a minimal system and allows you to specify the installation source. It is useful for system maintenance, rescue operations, or if you do not have a DVD drive and want to use an alternative installation source.
You only need to start the system from the binary OS distribution DVD (V33411-01). When you burn the .iso disk image, be sure to follow the instructions of burning an iso image according to your software, otherwise it may not be usable as a system startup media.