- Switching and routing
Out of these specializations, which have the highest scope in the industry and best job opportunities?
You mentioned the CCNP which is essentially the professional level of certification for switching and routing. The security professional designation is the CCSP certification and the voice professional certification is the CCVP. As of today, the CCSP and CCVP will allow the CCNA as a prerequisite; however, the CCVP (in June 2009) and the CCSP (in November 2011) will mandate that you have the CCNA specializations for voice and security respectively as a prerequisite. Wireless does not have a professional certification yet, but Cisco is working on it as we speak (or type for that matter). The design professional certification is the CCDP which requires the CCNA and the CCDA as a prerequisite.
As for the scope in the industry, it all boils down to the prospects available and the number of other professionals you are competing with. For instance, the CCNP is the most popular professional level certification to date because it covers many technologies including security, wireless, and some voice concepts. If you don't like crowds and are interested in a narrower focus of professional certification, the CCVP, CCSP, and CCDP might be a better fit for you.
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