Hi @RaveendraK 

As per the latest update from ServiceNow on 17th November, the CIS – Discovery Fundamentals (CIS-DF) certification is now mandatory for seven CIS mainline exams. This requirement cannot be ignored.

This means that if you are planning to pursue any of these seven CIS mainline certifications, you must first complete CIS-DF. If you have already passed any of these CIS mainline certifications, you are required to complete CIS-DF by December 2026; otherwise, all related CIS certifications will expire.

• Certified Implementation Specialist - Discovery
• Certified Implementation Specialist - Hardware Asset Management
• Certified Implementation Specialist - IT Service Management
• Certified Implementation Specialist - Security Incidence Response
• Certified Implementation Specialist - Service Mapping
• Certified Implementation Specialist - Software Asset Management
• Certified Implementation Specialist - Vulnerability Response

https://learning.servicenow.com/lxp/en/credentials/why-the-cis-data-foundations-cmdb-and-csdm-exam-a...