Do you have already knowledge of one or more programming languages? If so, you may take a look at C, C++, Assembler, SQL and eventually PHP. Depending in which area in security you would like to work, you may focus more on weblanguages than on others for example. Learning one or two scripting languages may help too (Python, Bash, Perl, Ruby, etc.). Personally I would say it doesn't matter much which programming language you learn..as long as you understand the concepts behind it, switching to another language isn't a big problem.
Further I would say it is not a must to obtain CCNA before going into Security, though it wouldn't hurt if you go for it (or another similar one, such as Network+ or depending on your previous knowledge Security+, both by CompTIA). Understanding topics covered in those would certainly help you for your further progressing. In CCNA you will also learn neutral network basics, though there is a good amount of Cisco specific stuff included (e.g. commands for operating Cisco devices) while the ones offered by CompTIA are vendor-independent.
As a first certification people at EH-Net often recommend Security+.
Last edited by UNIX
on Wed Sep 09, 2009 12:14 am, edited 1 time in total.