Really depends on your employment/education background PINGSTER and what area you actually want to work in.
CCNA isn't straightforward that you might be able to study something else alongside it. The material, though quite straightforward, does need learning inside and out as the pass mark is 85% and they word the questions so you have to know your stuff rather than just remembering answers verbatum.
Come back with more info. The folks on this site are very helpful in this area.
