Câu 27: ACCP-v6.2: Aruba Certified Clearpass Professional v6.2

If a client's authentication is failing and there are no entries in the Clearpass's Access Tracker, which of the following is a possible reason for the authentication failure?

1. A. The client used a wrong password.
2. B. The user is not found in the database.
3. C. The shared secret between Network Access Device and Clearpass does not match. — đáp án hiện tại
4. D. The user account has expired.
5. E. The user's certificate is invalid.