As for Linux, there is a very good reason to follow that operating system if you want to be a serious, full-time security professional, but it's not because RHCE or other Linux certification are where the market is (Red Hat's total certified population is under 30,000; Cisco's is probably over 600,000 by now, or 20 times larger). It's because so many of the good hacker and/or security tools (Snort, Nessus, Ethereal, etc., etc.) run...
on Linux, and because that's where so much of the "security action" takes place.
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