The cissp certification requires both the successful completion of the examination and an by a qualified third party, typically another similarly certified professional, the candidate’s employer, or a licensed, certified, or commissioned professional.

endorsement                  

Explanation:

              The CISSP stands for Certified Information Systems Security Professional. It is a certification which is granted by International Information System Security Certification Consortium.

             This certificate is given after the completion of the certification examination and with the final approval or agreement by a third party who is qualified enough and authorized to grant such approval.

             This third party may include a licensed professional, or a certified professional or by the candidate’s employer.

Hence the answer is --- "endorsement"