To renew your Cert, just pass 1 of exams on the same level or higher level. Some small restriction apply (sales exams don't renew)
Exam does not have to be within same tract (so not in DC)
Certs and Exams are valid for 3 years. You must complete certification track within that 3 year-time-frame.
Passing 1 exam will renew current Certs fro another 3 years.
so, Yes, pass DCUCI will renew CCNA for 3 years. you must complete (pass) all CCNP Data exams within 3 years of starting 1st one.
I added above "you must complete (pass) all CCNP Data exams within 3 years of starting 1st one."
I think this is still true; it was policy in the past; haven't seen any changes. see FAQ
DC has 5, but they asking for 4 out of 5 exams; still, that's lot of work.