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You can achieve a Cisco certification on the professional level in several different categories.  You can choose to become a Certified Network Professional – providing you the knowledge necessary to handle medium-sized networks, as well as several technologies.  Others get their Cisco certification in design, meaning they should be deeply familiar with and able to interconnect Cisco devices.  One may try being a Certified Security Professional – allowing them to become versed in Cisco security products.  Or you might desire to become a Certified Voice Professional, a certification that implies full knowledge of voice applications and networks.