Given the relatively small amount of detail you've provided about your on-the-job requirements, I see no reason why CCNA, CCNP, possibly CCDP, and possibly even a CCIE might not be good certifications for you. But unless your company's (or its customers') infrastructure(s) is based on Cisco components, studying Cisco won't help much. If your technical back- ground is strong, jump right onto the CCNA; otherwise, I recommend starting with A+, Network+, and i-Net+ to make sure you have the right computer and networking background under your belt before tackling the CCNA.
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