Hm well, always remember learning linux is inversely proportinal to a running linux system ! ;-)
This was the bad news perhaps. Now the good news. Yes your card is on the list of supported cards.
"will my PCMCIA D-Link DFE-670TXD NIC card work nativly?"
This depends on the redhat install program. Since i've not the Redhat distro i cannot promise
you that the install program will find it and configure it for you automatically.
If you're not planing to install linux via a connection to an other computer ( a net installation),you may
configure it later. At "http://pcmcia-cs.sourceforge.net" you can download the newest PCMCIA Howto document to learn
more about PCMCIA and linux.