AFAIK if you want to be pentester CCNA knowledge may help little bit. But cert may not help much…as of now two gold certs are oscp and cissp…
So read the books about ccna and gain the knowledge. Don’t spend money on certificate…
If you want worth the $$ or your currency is security tube or pentester academy certs… or at least their free videos or mega primers and of course ippsec videos…