Cisco DCIT 300-615 study plan

Map the 300-615 exam blueprint weighting to your own lab topology, listing which Data Center technologies (Nexus switching, NX-OS, ACI, UCS, storage networking) each major troubleshooting area touches

Build a baseline lab in Cisco Modeling Labs or EVE-NG with at least two Nexus switches running NX-OS, one ACI-capable fabric simulator or APIC simulator, and one UCS Emulator instance, and verify management-plane reachability from your workstation

Practice the disciplined troubleshooting sequence (define the symptom, scope the fault domain, collect show commands, isolate, remediate, verify) on three deliberately injected faults you create yourself

Configure and verify NX-OS foundational services: vPC domain, LACP port-channels, VLANs, and HSRP/VRRP, capturing the exact show command output that proves each is healthy

Diagnose Layer 2 forwarding problems by breaking vPC peer-link, vPC member links, STP root placement, and port-channel member mismatches one at a time and recording the resulting syslog and show command evidence

Interpret NX-OS control-plane and data-plane counters (show interface counters errors, show platform internal, ELAM lite) to distinguish a physical-layer fault from a policy or forwarding fault

Troubleshoot VLAN and trunking issues including native VLAN mismatch, allowed-VLAN pruning, and private VLAN misconfiguration, then document the fastest command to confirm each root cause

Configure and verify first-hop redundancy failover and OSPF/BGP neighbor establishment between Nexus devices, then break each adjacency and capture the debug output that identifies the cause

Trace a packet end-to-end across the ACI fabric by following the policy pipeline (tenant, VRF, bridge domain, EPG, contract) and identify which object is misconfigured when traffic is dropped

Use the APIC GUI and CLI (moquery, show faults, show health) to locate and clear fault codes, and practice resolving contract, EPG, and bridge-domain configuration faults you inject

Verify fabric discovery and inventory health: register a new leaf, confirm APIC-to-switch connectivity, and diagnose a failed discovery using the fabric membership and infra fault records

Compare ACI forwarding behavior in a single-pod fabric against your NX-OS VXLAN understanding, documenting where troubleshooting tooling differs between the two

Diagnose UCS managed-object faults by using UCS Manager fault, FSM, and audit logs to trace a service-profile association failure from start to finish

Troubleshoot blade and rack-server discovery problems including firmware mismatch, adapter and mezzanine issues, and CIMC connectivity failures

Verify SAN and LAN connectivity from a UCS service profile through the fabric interconnects, isolating a fault to the vNIC/vHBA template, the port-channel, or the upstream switch

Practice firmware upgrade troubleshooting by reviewing the upgrade impact and identifying the checks that must pass before and after an infrastructure pack activation

Troubleshoot storage networking faults including VSAN and zoning misconfigurations, NPV/NPIV issues, and FLOGI/PLOGI failures, using show commands to prove where the login chain breaks

Diagnose Fibre Channel port-channel and ISL problems, and verify fabric redundancy and rebuild behavior after an ISL failure

Correlate a storage access failure across the stack (host, UCS, MDS or Nexus, array) to determine which layer actually owns the fault

Practice interpreting device-alias, zone-set activation, and default-zone behavior when a host cannot see its LUN

Troubleshoot data-center routing and overlay issues: OSPF and BGP adjacency problems, route redistribution loops, VXLAN VTEP reachability, and EVPN route-type mismatches

Diagnose multicast and underlay reachability faults that break VXLAN or ACI multipod traffic, using mtrace, PIM registrations, and interface counters

Verify management-plane and control-plane security troubleshooting: AAA/TACACS+ failures, RBAC role problems, SSH and SNMP access issues on NX-OS

Build a fault-injection checklist for routing and overlay scenarios and run through at least four of them under time pressure

Consolidate every troubleshooting area into a single command and tooling reference, organized by symptom rather than by technology

Re-run your weakest three scenarios from weeks 2 through 6 without notes and confirm you can reach the root cause in under ten minutes each

Practice reading NX-OS and APIC logs, tech-support collections, and core dumps to extract the decisive evidence quickly

Review automation and programmability troubleshooting basics: verifying NX-API, Python or Ansible connectivity, and diagnosing authentication or payload errors

Take two full-length timed practice exams or scenario sets covering all troubleshooting areas, then analyze every wrong answer by root cause category

Revisit the two weakest categories from the practice analysis and run targeted labs until the fault is isolated correctly on the first attempt

Write and rehearse a one-minute verbal explanation of your troubleshooting methodology for each major technology area, since scenario questions reward structured reasoning

Finalize your exam-day logistics: confirm appointment, environment requirements, and a personal time-allocation strategy for the question set