Is the current CCNA certification valid for 1 or 2 years? I want to renew my CCNP, as well, but I realize that I need an existing valid CCNA certification to do so.
I most recently passed the CCNA exam in February, 2007.
Both are good for three years from the passing of your last required exam.
When you re-cert your NP, your NA will also renew.
If you are talking about a stand-alone exam expiration (a component exam for a certification), then it expires in two years from the pass date (i.e., certified, three years, not-yet-certified - Two years)