Does one use all the qualifications they have studied for in a career, for example, CCNA, CPA, ACCA, when the 1st degree and Masters are good enough?

The thing is that during our studies, formal Education we study each area of Sciences, e.g., Data communication, Networking, programming or Web. So if a person wants to be in specific side, he needs to know the latest trend, Technology and knowledge of these technologies. , these certification also create impact in employer that this person is recognized by world leader of Network device like, Cisco, IBM etc. thats why we study these courses after formal education.