The CCNA is a pretty good credential overall, but it's most germane in environments where Cisco gear is in use. 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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