CCNP certification is valid for three years, in the three-year validity period, you can test the CCIE experimental exams, to become a higher gold CCIE, because the difference between CCIE and CCNP lies in the experimental exams, the written part of the test is the same, but also in the validity period, you can choose to pass any of the CCNP core exams, or through any two CCNP optional exams, you can refresh the Validity period.