Do you really need to have 2 years on-the job Networking?
Do you really need to have 2 years Networking before taking this security+ exam?
www.boson.com says "The recommended prerequisite for the Security+ exam (SY0-101) candidate is to have the knowledge and skill equivalent of the material comprised within the CompTIA A+ and Network+ certification exams."


Comments
This what CompTIA says:
You'll find it here: http://www.comptia.org/certification/security/default.aspx
You'll see that it is testing for "security knowledge mastery" of one who has the specified experience. Key word--knowledge. Boils down to; if you've got the guts to try it, and the exam fee, of course,--go for it!
There are certs that require proof/references/whatever, like CISSP. But not CompTIA Security+. And, the 2 certs are worlds apart. CompTIA, after all, has to say something to promote their certs--don't they? And, Boson wants to encourage people to purchase their practice exams for A+ and Network+ as well as for Security+.
I would say, if you want it, go for it. No one will stop you from taking it.
This is all my opinion. Best of luck!
Since studying the sec+ exam objectives, it is almost entirely on the theology of security and how it works logically. To me, you don't need any experience to study and take this exam, however, it would most certainly help with the way you retain the information and how much you need to study.
iCertify.net
InfoSecWeb.com
FreakNotes.com