A wise man once told me that the hallmark of a truly interesting question was that the answer always begins with the phrase "that depends..." By that criterion, your questions qualify as interesting. And the answer begins with the usual formula: The certifications you pursue for the future will depend on the kind of job role you wish to grow into. Thus, if your goals are to become a system/network administrator, the Unix/Linux administration path is probably best for you (though you should also consider other popular operating systems such as Microsoft Windows -- MCSA or MCSE, to be more specific -- or Novell NetWare -- CNA, CNE, or MCNE, to be more specific again). OTOH, if your inclinations lean you more toward network engineering, the Cisco credentials -- CCNA, CCNP, and on to other, more senior Cisco certs -- would represent a better growth path for you.
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