My background is in telecommunications and internetworking. I have experience configuring backbone and CPE routers....
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I have my CCNA and a good understanding of design concepts, etc. Now I want to get into the Network Security field. What is the first cert I need to obtain? Security+? My short answer to your question is "Yes," but I'd also suggest you look at the TruSecure TICSA and the SANS GSEC to pick the entry-level certification that fits your budget, your needs, and your schedule best.
With an entry-level cert in hand, you'll be able to doing more work that involves security as opportunities arise--obtaining experience will be your next necessary step in moving toward more advanced certs in information security and toward full-time work as a security professional.
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