Introduction

Working as an information technology professional for many years, I have pursued a considerable number of certifications. However, I have always reserved a special place in my heart for my first one: Cisco Certified Network Associate (CCNA).

Back in 1999, I was thrilled to discover that having obtained this certification was going to radically change my career for the better. Undoubtedly, I was being recognized by the market as a tested network professional, and better job opportunities immediately started to appear.

What surprised me the most was that the CCNA certification did not dwell too much on products. Instead, it focused on foundational networking concepts, which I still use today on a daily basis. Smartly, Cisco had already ...

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