The CCNA is a pretty good credential overall, but it's most germane in environments where Cisco gear is in use....
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If you're currently employed, you should let your employer's equipment choices and deployment decisions guide your certification focus; if you're not currently employed in a first line support position, Cisco is the market leader for routers and switches, so it indeed makes sense to pursue the CCNA as a good starting off point. That said, only few positions require the CCNA, so it's best to think of the CCNA as a stepping stone to other Cisco specializations or professional level certifications (namely, the CCNP, CCDP, CCIP, CCVP and CCSP).
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