Troubleshoot faults that affect Cisco Application Centric Infrastructure fabric operation, tenant behavior, and connectivity paths with a course centered on diagnostic work rather than introductory platform coverage. ENTERONE CPLL-DCACIT-V5 addresses the areas an engineer must correlate when an application, endpoint, tenant policy, or fabric component does not behave as expected. The course provides a focused learning path for interpreting problems across the ACI environment and narrowing the source of a connectivity failure. This course fits network engineers and ACI operations personnel responsible for maintaining application connectivity in policy-driven data center fabrics. Its scope connects the fabric layer with tenant-level constructs and the connectivity outcomes experienced by attached endpoints. That focus is useful when a symptom cannot be isolated by examining a single device or configuration area alone, and the investigation must account for relationships between fabric behavior, tenant configuration, and traffic reachability. CPLL-DCACIT is the course designation associated with this versioned ordering code. Its distinguishing emphasis is deep ACI troubleshooting: diagnosing fabric, tenant, and connectivity issues rather than covering general platform concepts. Use it to strengthen the technical process behind incident investigation, fault isolation, and remediation planning in Cisco ACI environments.