You must renew F5 certifications every 2-years.
Approximately 120 days prior to a certification becoming expired, candidates will be issued exam authorizations to re-certify their certification;
Candidates will be able to schedule their re-certification exam for 90-days prior to the expiration date and up-to 30 days after ( until the Final Renew date);
If candidates re-certify prior to their expire date, their certification (and prerequisite certifications) will be extended two-years from the expire date;
If candidates re-certify after their expire date, the certification (and prerequisite certifications) will be extended two-years form the expire date;
If candidates do not re-certify by the final renew date, their certification (and any prerequisite certifications) will be ended and the candidate will need to start over to achieve certification again.
Let's say you achieved the F5-CA on January 1st, 2020 with an expiration date of January 1st, 2022 and a final renew date of February 1st, 2022.
You will receive an exam authorization to retake exam 201 (the last exam you took to achieve the certification) around October 1st, 2021 (~120 days prior to the expiration date).
You can schedule to take your re-certification exam anytime between October 1st, 2021 and February 1st, 2022 (inclusive).
If you take and pass exam 201 within your eligibility window, your certification will be renewed with a new expiration date of January 1st, 2024 (2-years after the prior expiration date).