I don’t know if learning anything else will get you a job…that’s ultimately up to you – your drive/motivation, your career networking to meet the right people and have them get to know you and so on. Studying networking is certainly not a bad start. That knowledge can land you practically anywhere in IT or security. Check out TCP/IP For Dummies. That’s one of the original books I read that took my network knowledge up many levels.
Also, I have written extensively for TechTarget on the subject of IT and security careers. Check out those resources as I think they might be of value to you. Best of luck and keep us posted!