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CentOS / Redhat: Chroot And Mount Raid Or Actual Hard Disk From Rescue Kernel / CD

Something is wrong with my RHEL networking configuration so I booted using my ISPs remote rescue kernel mode to fix my system. How do I mount and chroot into actual installation to fix the problem? How do I boot from any Live Linux CD and chroot into /dev/sda1 or /dev/md0 to fix the problem or recover the data?
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Linux RAM Disk: Creating A Filesystem In RAM

Software RAM disks use the normal RAM in main memory as if it were a partition on a hard drive rather than actually accessing the data bus normally used for secondary storage such as hard disk. How do I create and store a web cache on a RAM disk to improve the speed of loading pages under Linux operating systems?
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Linux Create Software RAID 1 (Mirror) Array

How do I create Software RAID 1 arrays on Linux systems without using GUI tools or installer options? How do I setup RAID 1 array under Linux systems?
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Mount Command In UNIX

How do I use the mount command in UNIX to mount my file systems?
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Linux mount and access a compact flash card – howto

Q. I have a compact flash card reader hardware device connected to USB port of computer system. Now how do I mount and access a compact flash card connected to this Linux system (Fedora Core)?

A. Your compact flash card will automatically detected by Linux. First create a mount point (type the following command as root user):

# mkdir -p /mnt/cflashcard
If you don’t have any SCSI device, your first partition on a compact flash card should be /dev/sda1 (second will be /dev/sda2 and so on). If you have 1 SCSI device attached, your first partition on a compact flash card should be /dev/sdb1.

Mount partition using mount command:
# mount /dev/sda1 /mnt/cflashcard
To see or access files:
# cd /mnt/cflashcard
# ls -l

Open /etc/fstab file:
# vi /etc/fstab
Add an entry (append) to /etc/fstab file:
/dev/sda1 /mnt/cflashcard auto user,rw,exec 0 0
Save and close the file.

How do I unmount or unplug card?

First unmount card with umount command and then unplug card:
# umount /mnt/flash