Let's try to recall the topics I've covered so far in my books. I have covered (covered, not mastered):

Networking:
-CCNA
-BSCI
-ISCW
-BCMSN
-ONT
-CCIE Theory

Operating System:
-Introduction to Redhat Linux
-Windows Server 2008 MCSA
-Windows Server 2008 MCSE

I think I've more or less met the requirements for Networking. The minimum, at least. I'm about to research on Windows Server 2008 R2. Then perhaps I'll move into Certified Ethical Hacker. I'll begin going through the syllabus on Sunday. Definitely I'll need more Linux in the future, but that can wait :)