start with CompTIA Security+, CISSP after that
DimaYasny
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yes you need to know switches and router how they function and how to secure them i suggest you do Security + ccna then cissp, reason being you want to get a firm grasp of the Cisco systems and this vast and some what complex. CISSP focus only on security if your brain can manage them all at one i know a great boot camp you can go to and get all in as little as 2 week (does require prior knowledge to be of benefit)
bobbyraw
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well, another good cert to have would be the one from CheckPoint and from Juniper
DimaYasny
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