Linux for dummies - the df command - EASY POINTS

Is this telling me tha I have one large partition, one partition for boot, and Shared memory?

Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
                      74151120   2773840  67610600   4% /
/dev/sda1               101086     34285     61582  36% /boot
none                   2074516         0   2074516   0% /dev/shm

Also, mount gives me:

 mount
/dev/mapper/VolGroup00-LogVol00 on / type ext3 (rw)
none on /proc type proc (rw)
none on /sys type sysfs (rw)
none on /dev/pts type devpts (rw,gid=5,mode=620)
usbfs on /proc/bus/usb type usbfs (rw)
/dev/sda1 on /boot type ext3 (rw)
none on /dev/shm type tmpfs (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)

From this, it looks like I have only one SCSI drive - is this correct? Also, where is my CD-ROM AND what is sunrpc?

Sorry - I am new to Linux.