Yes CCNA used to cover all associate level but they have changed it over last few years ,you can see it in the career path cert section , click on any exam to see what the prerequisite is , so if you want to do CCNP R&S you need CCNA R&S etc
http://www.cisco.com/c/en_in/training-events/career-certifications.html
but say you get to CCNP or CCIE level it will renew other exams by taking exam in same train in some cases , so if you repeat a 624 exam at that level it will renew all other 624 exam