300-615 Cisco Troubleshooting Cisco Data Center Infrastructure (300-615 DCIT) v1.1 Free Practice Exam Questions (2026 Updated)

Associate bashusers with the Cisco NX-OS dev-ops role and activate the bash-shell feature is the required fix because the automation failure is caused by execution context, syntax, or resource state around Bash, Cisco Nexus, Nexus 9000, Cisco Nexus 9000. On Cisco Nexus switches, automation is not a single feature; EEM policies, CLI actions, Guest Shell Linux commands, REST payloads, and scheduled jobs are evaluated by different subsystems. A script can fail even while the switch itself has connectivity or the command works interactively. The selected answer supplies the missing requirement, such as the correct event/action, DNS or resource setting, API URI, payload format, feature enablement, or reboot needed for a Guest Shell change to take effect. The other choices address adjacent features but do not satisfy the failing subsystem. After applying the fix, the engineer should verify the policy registration, job result, API response code, or Guest Shell runtime state and confirm that the intended command is no longer blocked or silently ignored.

The correct remediation is role name User1 no rule 4. In Cisco data center troubleshooting, the first priority is to isolate whether the failure is caused by the underlay, overlay control plane, first-hop gateway behavior, or a consistency parameter. This item is centered on Cisco Nexus, Nexus 9000, Cisco Nexus 9000, so the selected action targets the condition that prevents normal forwarding rather than masking the symptom. Cisco Nexus and ACI guidance treats vPC, VXLAN EVPN, OTV, OSPF, BGP, HSRP, and LACP issues as state-dependent technologies: a neighbor, peer, VLAN, VNI, multicast group, timer, MTU, or policy mismatch can leave the protocol partially operational while traffic is still dropped. The rejected alternatives either change unrelated attributes, introduce a new inconsistency, or affect only a secondary behavior. The operational check after applying the fix should be to confirm adjacency or peer state, validate the relevant route/MAC/endpoint table, and test traffic in the affected VLAN or VRF. This aligns with Cisco DCIT network troubleshooting methodology for isolating control-plane state before changing data-plane policy.

Use a predefined local disk configuration policy is the correct fix under Cisco SAN troubleshooting practice. The issue described involves service profile, SAN boot, where the operating state depends on the correct combination of port type, VSAN, fabric service, and access-control database. MDS and Nexus SAN features do not infer missing policy: if the active zoneset, fabric-binding database, fcdomain, NPIV setting, or FCoE/LLDP negotiation is wrong, the link may come up physically but the initiator will not reach the target. The selected answer corrects the missing or mismatched element. The remaining choices either act at the wrong layer, change a non-causal parameter, or provide only a temporary reset. After applying the fix, a proper Cisco validation path is to review show interface, show flogi database, show fcns database, show zoneset active, and any isolation or merge-failure logs. That confirms the storage network is operationally consistent.

The answer is Configure a tenant Layer 3 VNI because Cisco Nexus and ACI forwarding depends on exact agreement between the devices participating in the feature. The scenario references VXLAN, VNI; those technologies fail in predictable ways when required parameters do not match or when the required control-plane advertisement is absent. In DCIT troubleshooting, the engineer should identify the failed dependency, correct that dependency, and then verify the operational table that proves the fix. For example, vPC and EVPN checks focus on consistency, VNI/VRF bindings, peer-gateway behavior, and host-route advertisement; routing checks focus on neighbor state, MTU, timers, authentication, next-hop, and route preference. The selected answer addresses the dependency that blocks forwarding. The distractors are plausible because they touch related features, but they do not resolve the specific failure condition. Post-change validation should include protocol state, learned endpoint or route entries, and a traffic test across the affected path.

The correct answer is the selected command set. Cisco NX-OS automation features are context-sensitive: Guest Shell, Bash, EEM, scheduler, NX-API, REST calls, and Python scripts each run with their own parser, privilege model, environment, and resource limits. The scenario involves EEM, SNMP, Cisco Nexus, and the selected action corrects the missing execution condition. Cisco documentation for Nexus programmability states that Guest Shell resources and networking must be configured inside the Guest Shell context, EEM applets require a valid event statement and event-default when the intercepted CLI command must continue, and API calls must target the correct managed object or class. The alternative answers either operate in the wrong context, omit a required trigger/action, or correct a parameter unrelated to the failure. Validation should include running the command manually in the same context, checking logs or return codes, and confirming that the automation completes without blocking the normal NX-OS operation it observes.

Cisco troubleshooting logic supports Change channel-group ID from 9 to 2 on N9K-3 as the required fix. In this question the symptoms point to vPC, and the defect is best handled by correcting the exact control-plane or consistency condition. Nexus platforms can show interfaces or peers as configured while still refusing to forward traffic if a vPC Type-1 parameter, VLAN allowance, MTU, HSRP version, EVPN route, or routing attribute is wrong. Cisco methodology is to avoid broad resets unless the state machine is stuck; instead, correct the mismatched parameter and verify that the resulting operational state becomes stable. The other choices do not remove the root cause, or they modify a setting that is not used by the failing protocol exchange. After the change, the engineer should review the peer status, route or MAC table, and counters for drops or inconsistency messages. That sequence proves that the network fabric is fixed, not merely restarted.

The correct remediation is key1 accept-lifetime 00:00:00 Jun 01 2018 23:59:59 Sep 01 2020. In Cisco data center troubleshooting, the first priority is to isolate whether the failure is caused by the underlay, overlay control plane, first-hop gateway behavior, or a consistency parameter. This item is centered on HSRP, so the selected action targets the condition that prevents normal forwarding rather than masking the symptom. Cisco Nexus and ACI guidance treats vPC, VXLAN EVPN, OTV, OSPF, BGP, HSRP, and LACP issues as state-dependent technologies: a neighbor, peer, VLAN, VNI, multicast group, timer, MTU, or policy mismatch can leave the protocol partially operational while traffic is still dropped. The rejected alternatives either change unrelated attributes, introduce a new inconsistency, or affect only a secondary behavior. The operational check after applying the fix should be to confirm adjacency or peer state, validate the relevant route/MAC/endpoint table, and test traffic in the affected VLAN or VRF. This aligns with Cisco DCIT network troubleshooting methodology for isolating control-plane state before changing data-plane policy.

The selected resolution is Enable N9K-1 mode to N-Port ID Virtualization because the failure is in the Fibre Channel/FCoE control path around UCS. Cisco MDS and Nexus platforms separate configuration from operational state: a VSAN, zone, vFC binding, device alias, or port-security entry can exist in configuration but still fail if it is not active, correctly merged, or allowed on the link. The correct option addresses the fabric condition that prevents communication. The incorrect options are technically adjacent but would not repair the specific dependency; for example, changing unrelated databases or resetting ports without correcting policy leaves the same failure to recur. Cisco SAN troubleshooting therefore starts with port role and VSAN checks, then confirms fabric services such as fcdomain, FSPF, zoning, fabric binding, and name-server information. The expected validation is that the port becomes operational, the initiator and target appear in the appropriate databases, and permitted zone members can communicate.

Use the force option to identify rejected devices is the required SAN-side correction. In Cisco storage fabrics, symptoms such as isolated ports, missing targets, failed zone merges, vFC down state, or inaccessible LUNs are rarely solved by changing a random endpoint setting. The engineer must validate the FC control-plane dependency associated with port security: VSAN assignment, trunk allowance, FSPF parameters, fcdomain uniqueness, NPIV support, NPV uplink behavior, DCBX/LLDP negotiation, and active zoning. The selected answer is the one that restores that dependency. Other choices may be valid operational commands in a different failure, but they do not address the precise point where fabric membership or access control is broken. Cisco guidance is to verify the active database and the operational database separately because a configured object is not necessarily active in the fabric. Post-remediation checks should include interface state, VSAN status, FLOGI/PLOGI, zoneset membership, and target visibility from the initiator.

The correct answer is Configure the interface as a trunk port. Cisco MDS and Nexus SAN troubleshooting is driven by fabric state: the host and target must be in the correct VSAN, must complete FLOGI/PLOGI where applicable, and must be permitted by active zoning, fcdomain, FSPF, NPV/NPIV, or port-security policy. This question focuses on VSAN, FCoE, so the selected action fixes the dependency that prevents the initiator, target, or inter-switch link from becoming usable. Cisco documentation emphasizes checking VSAN membership, active zonesets, correct port mode, fabric binding, device-alias consistency, and the relevant FC databases before changing unrelated server settings. The distractors either target a different database, use the wrong port role, or would not cause the observed Fibre Channel state to change. After the fix, the engineer should confirm the interface state, FLOGI database, name-server entries, zoneset activation, and successful initiator-to-target reachability with tools such as fcping or fabric show commands.

The selected answer, Reset the peer I/O module, follows Cisco UCS operational logic. UCS Manager is policy-driven, so troubleshooting must determine whether the problem is caused by hardware discovery, service profile association, firmware activation, boot order, storage presentation, or management integration. The scenario points to UCS, firmware; that is why the selected action fixes the root condition rather than merely restarting the server. The wrong options either affect a different policy, require unnecessary disruption, or assume that physical connectivity alone is sufficient. Cisco documentation for UCS server boot and firmware management stresses that boot policies must include the correct target details, firmware workflows must complete their FSM stages, and hardware changes often require acknowledgement or re-acknowledgement before UCS Manager uses the new inventory. After remediation, the engineer should confirm that the UCS fault is cleared, the server association or discovery state is complete, and the operating system or management service can use the intended path.

The selected option, Add a domain and name server to the resolv.conf file, is correct for the automation path described. Cisco NX-OS requires precision in EEM applets, scheduler jobs, Guest Shell operations, and REST/NX-API syntax. The affected element is Guest Shell, Cisco Nexus, Nexus 9000, Cisco Nexus 9000; therefore, the fix must be applied to the component that actually executes the action. For EEM, that means a valid event detector and explicit actions, with event-default when the matched CLI command should continue. For Guest Shell and Bash, DNS, proxy, resource allocation, and reboot behavior are local to the Linux container. For REST calls, the class name, method, authentication, and XML/JSON structure must match the APIC or NX-OS object model. The distractors usually change the switch globally or alter an unrelated command. Cisco DCIT automation troubleshooting confirms the fix by checking the returned error, then rerunning the exact job, script, or API operation in the same context.

fcping is the required SAN-side correction. In Cisco storage fabrics, symptoms such as isolated ports, missing targets, failed zone merges, vFC down state, or inaccessible LUNs are rarely solved by changing a random endpoint setting. The engineer must validate the FC control-plane dependency associated with UCS: VSAN assignment, trunk allowance, FSPF parameters, fcdomain uniqueness, NPIV support, NPV uplink behavior, DCBX/LLDP negotiation, and active zoning. The selected answer is the one that restores that dependency. Other choices may be valid operational commands in a different failure, but they do not address the precise point where fabric membership or access control is broken. Cisco guidance is to verify the active database and the operational database separately because a configured object is not necessarily active in the fabric. Post-remediation checks should include interface state, VSAN status, FLOGI/PLOGI, zoneset membership, and target visibility from the initiator.

Cisco troubleshooting logic supports N9K2(config)# interface eth1/2 N9K2(config-if)# ip address 172.18.1.200/24 as the required fix. In this question the symptoms point to OSPF, Cisco Nexus, Nexus 9000, Cisco Nexus 9000, and the defect is best handled by correcting the exact control-plane or consistency condition. Nexus platforms can show interfaces or peers as configured while still refusing to forward traffic if a vPC Type-1 parameter, VLAN allowance, MTU, HSRP version, EVPN route, or routing attribute is wrong. Cisco methodology is to avoid broad resets unless the state machine is stuck; instead, correct the mismatched parameter and verify that the resulting operational state becomes stable. The other choices do not remove the root cause, or they modify a setting that is not used by the failing protocol exchange. After the change, the engineer should review the peer status, route or MAC table, and counters for drops or inconsistency messages. That sequence proves that the network fabric is fixed, not merely restarted.

The selected answer, Select the " Graceful Maintenance " checkbox; Place each leaf switch in a different upgrade group, follows Cisco UCS operational logic. UCS Manager is policy-driven, so troubleshooting must determine whether the problem is caused by hardware discovery, service profile association, firmware activation, boot order, storage presentation, or management integration. The scenario points to ACI, UCS, Cisco Nexus; that is why the selected action fixes the root condition rather than merely restarting the server. The wrong options either affect a different policy, require unnecessary disruption, or assume that physical connectivity alone is sufficient. Cisco documentation for UCS server boot and firmware management stresses that boot policies must include the correct target details, firmware workflows must complete their FSM stages, and hardware changes often require acknowledgement or re-acknowledgement before UCS Manager uses the new inventory. After remediation, the engineer should confirm that the UCS fault is cleared, the server association or discovery state is complete, and the operating system or management service can use the intended path.

[ ] fcdomain restart disruptive vsan 5; [ ] fcdomain domain 23 static vsan 5 is the correct fix under Cisco SAN troubleshooting practice. The issue described involves VSAN, FSPF, where the operating state depends on the correct combination of port type, VSAN, fabric service, and access-control database. MDS and Nexus SAN features do not infer missing policy: if the active zoneset, fabric-binding database, fcdomain, NPIV setting, or FCoE/LLDP negotiation is wrong, the link may come up physically but the initiator will not reach the target. The selected answer corrects the missing or mismatched element. The remaining choices either act at the wrong layer, change a non-causal parameter, or provide only a temporary reset. After applying the fix, a proper Cisco validation path is to review show interface, show flogi database, show fcns database, show zoneset active, and any isolation or merge-failure logs. That confirms the storage network is operationally consistent.

Set the community to 65000:65000 under the route map is the valid corrective action because the failure described is a protocol or fabric state problem, not a generic connectivity issue. For BGP, Cisco troubleshooting expects the engineer to compare both endpoints of the relationship: vPC peers must agree on consistency parameters, HSRP peers must exchange hellos in the same VLAN and version context, OSPF/BGP peers must match the attributes required for stable adjacency, and VXLAN EVPN must advertise the correct host or prefix information. The selected option restores that required state. The other options either operate on the wrong layer, change a value that is not used to form the relationship, or would make the peer relationship less deterministic. A clean validation is to inspect the control-plane table first, then verify the forwarding table, and finally test end-to-end traffic. This is the Cisco-preferred approach because it avoids random changes and confirms that the fabric is forwarding based on correct protocol state.

The correct action is the drag-and-drop mapping shown in the answer key. Cisco UCS troubleshooting depends on the relationship between policy, inventory discovery, firmware state, and server identity. The question involves firmware, fabric interconnect, so the selected option fixes the UCS component or policy that directly controls the failure. In UCS Manager, service profiles, vNIC/vHBA templates, boot policies, firmware packages, server pools, adapters, fabric interconnects, and I/O modules are applied through a managed model; a server can fail even when basic IP reachability exists if the relevant policy is incomplete or the hardware inventory has not been acknowledged correctly. The distractors typically change an unrelated object, force a disruptive recovery without fixing the policy, or apply to a different UCS mode. Cisco guidance is to verify faults, FSM stage, inventory status, association status, and the specific boot or connectivity policy before taking action. After the remediation, validate that the fault clears, the FSM completes, and the server or fabric component returns to the expected operable state.

The selected answer, 1. Connect Fabric Interconnect B and execute “Erase configuration” 2. Reboot Fabric Interconnect B. 3. Add the subordinate Fabric Interconnect to the cluster, follows Cisco UCS operational logic. UCS Manager is policy-driven, so troubleshooting must determine whether the problem is caused by hardware discovery, service profile association, firmware activation, boot order, storage presentation, or management integration. The scenario points to fabric interconnect; that is why the selected action fixes the root condition rather than merely restarting the server. The wrong options either affect a different policy, require unnecessary disruption, or assume that physical connectivity alone is sufficient. Cisco documentation for UCS server boot and firmware management stresses that boot policies must include the correct target details, firmware workflows must complete their FSM stages, and hardware changes often require acknowledgement or re-acknowledgement before UCS Manager uses the new inventory. After remediation, the engineer should confirm that the UCS fault is cleared, the server association or discovery state is complete, and the operating system or management service can use the intended path.