Red Hat Certificate of Expertise in Directory Services and Authentication Exam (EX423)

NOTE:  This exam and credential is no longer available.

The Red Hat® Enterprise Directory Services and Authentication Expertise Exam is a performance-based test of the skills covered in Red Hat Enterprise Directory Services and Authentication (RH423). To enroll in this exam, candidates must hold a current Red Hat Certified Engineer (RHCE®) certification.

Associated certifications

An RHCE that passes this exam will have earned a Certificate of Expertise, which counts toward earning an Red Hat Certified Security Specialist (RHCSS), Red Hat Certified Datacenter Specialist (RHCDS), and Red Hat Certified Architect (RHCA) certification.

Red Hat Certificates of Expertise

Certificates of Expertise credentials are earned when an RHCE passes an upper-level, performance-based expertise exam in specialized areas of system administration.

Red Hat Certified Security Specialist ― RHCSS

An RHCSS certification may be earned by an RHCE who has demonstrated deeper capabilities in networking services security, directory services, authentication, and SELinux policy management.

Red Hat Certified Datacenter Specialist ― RHCDS

An RHCDS certification may be earned by an RHCE who has demonstrated the skills required to use a broader set of tools from the Red Hat portfolio to implement reliable, scalable solutions.

Red Hat Certified Architect ― RHCA

An RHCE who earns the RHCA certification bring an exceptional breadth and depth of knowledge to the biggest IT challenges. RHCA certification incorporates the skills and knowledge of RHCDS plus advanced networking services security, system monitoring, and performance tuning.


Classroom training

  • Exam candidates must have a current RHCE certification at the time of enrollment.

  • This exam is performance-based, meaning that candidates must perform tasks on a live system, rather than answering questions about how one might perform those tasks.

  • The hands-on nature of this exam makes real-world experience a critical facet of preparation.

  • Exam results are emailed within 5 business days following the exam.

  • See recertification policies for more information regarding current window for all credentials.

Length:4 hours ,  


Training units: 2

Individual Exam Session

  • Take this exam on your time in one of our exam testing stations at select locations. Learn more about this option.


  • Experienced Linux® system administrators responsible for user account information and secured enterprise authentication mechanisms across multiple operating systems

  • An RHCE interested in earning a Red Hat Certification of Expertise or an RHCDS, RHCSS, or RHCA certification


Exam candidates must:


This exam prepares you for these credentials:

Certificates of Expertise are incremental credentials attached to an RHCE certification that demonstrate skills and knowledge in specialized areas.