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Linux upgrade procedure

I have a Dell 2950 (actually have 3-2950's and 2-6850's but am starting on this 1-2950) and have installed RHEL4 2.6.9-5-EL-smp-i686.
Documentation indicates that Oracle will require at least RHEL4 2.6.9-5.0.5 EL or higher.
What are all the steps required to do this upgrade?

I will then have the need for telnet to be available.  What steps do I take to make that happen?
All assistance is much appreciated.
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Deepak Kosaraju
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ostwaldl

wrt "I will need telnet available":

telnet is an unsecure protocol for remote login (user id's and passwords are sent in the clear), so I strongly recommend using ssh instead.  There is really no situation that you need to use telnet instead of ssh..there are ssh clients for every platform.  

The SSH in RHEL4 has host access controls available through the librwap library (and configured through /etc/hosts.allow and /etc/hosts.deny)
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Actual answer to the first part of my question would be to go to RHN and search for kernel.
Once the list comes up, find the particular kernel for this system and for the given requirements and then download to the system and then do a 'rpm -ivh kernel-name'.
When you boot, it will default to the new kernel but you will have the option to select the old kernel if you desire.
Once you are happy with the new kernel, you can do a 'rpm -e old-kernel-name' to remove the previous version.