some mistakes in this article
Please be careful with this information. The editing was not very good. Most Professional level certs require the Associate level cert or a CCIE. For sure the CCDP does require the CCDA and a CCNA (even though the CCNA is not needed for the CCDA).. All this information is easily gotten on Cisco's web site. IMHO if you are going to leave out the CCIE level, you might as well leave ou the CCENT which is a useless cert. Cisco has all sorts of other Certifications that are important if you are working for a vendor or reseller.