The following level of experience or equivalent knowledge is recommended:
CCNA certifications are valid for three years. To recertify, pass one of the following before the certification expiration date:
- Any current associate-level exam except for the ICND1 exam
- Any current 642-XXX professional-level or any 300-XXX professional-level exam
- Any current 642-XXX Cisco specialist exam.
- Any current CCIE written exam or current CCDE practical exam
- The Cisco Certified Architect (CCAr) interview and the CCAr board review to extend lower certifications.
Visit Cisco's site for additional recertification information.