300-615 Troubleshooting Cisco Data Center Infrastructure (DCIT) Practice Questions
Prepare for 300-615 with more than an answer.
- Exam fee
- $300 USD
- Level
- Professional
- Valid for
- 3 years
Domains covered on the exam 5
- Network25%
- Compute Platforms25%
- Storage Network15%
- Automation15%
- Management and Operations20%
- 1
A Cisco Intersight administrator notices that a newly installed UCS C-Series server is failing to claim. The Device Connector status in the CIMC GUI shows 'Connection Error'. A packet capture reveals that the server is sending SYN packets to
svc.intersight.comon port 443 but receiving no response. What is the most likely cause?Show answer details
Correct answer: B
If SYN packets are sent but no response is received (timeout), it indicates that the traffic is being dropped silently by a firewall or ACL on the path. If DNS were the issue, the capture wouldn't show SYN packets to the destination IP (assuming resolution succeeded or wasn't attempted). The Device Connector requires outbound TCP 443 access.
- 2
Which TWO conditions can cause a Cisco UCS B-Series blade discovery to stall at the 'Link Down' stage? (Select TWO)
Show answer details
Correct answer: A, C
Server ports must be configured as 'Server' ports. If configured as Appliance, Monitor, or Uplink ports, the FI will not attempt the discovery protocol for a blade chassis connection, resulting in a physical link but no logical discovery (or link down appearance in logical view).
If the I/O Modules are not powered or seated correctly, the physical link cannot come up. The 'Link Down' status in the FSM specifically points to layer 1/2 connectivity issues between the FI and the Chassis IOM.
- 3
A storage administrator observes that an ISL between two MDS 9000 switches is not forming. The output of
show interface fc1/1shows the status as 'Error Disabled' and the reason 'Isolation due to zone merge failure'.Which command should be used to identify the specific zoning mismatch causing the merge failure?
Show answer details
Correct answer: D
The command
show zone internal merge-error vsan(orshow zone merge-error) is the specific command to view the exact reason for a zone merge failure, such as mismatching content in the active zoneset (e.g., two zones with the same name but different members). - 4
True or False: In a Cisco ACI Multi-Site deployment, if the 'Optimize WAN Bandwidth' option is enabled for a specific site, multicast traffic between sites is dropped if there are no active receivers in that site.
Show answer details
Correct answer: A
This is True. When 'Optimize WAN Bandwidth' (multicast dampening) is enabled, the ISN/spine will only forward multicast traffic to a remote site if there is an active IGMP report (receiver) in that site. Without this, multicast is flooded to all sites in the multicast group.
- 5
A network engineer is troubleshooting a Python script that uses the NX-API to gather interface statistics. The script fails with a JSON decoding error. The engineer prints the raw response and sees the following:
{"jsonrpc": "2.0", "error": {"code": -32600, "message": "Invalid Request"}, "id": null}What is the primary cause of this error?
Show answer details
Correct answer: B
Error code -32600 in JSON-RPC 2.0 specifically maps to 'Invalid Request'. This means the JSON structure sent is valid JSON (it parsed), but the object structure does not meet the API requirements (e.g., missing 'method' or 'params' fields required by the NX-API JSON-RPC schema).
- 6
A vPC Type-1 inconsistency between two vPC peers in a VXLAN EVPN setup is discovered. Which two actions need to be attempted to resolve the issue?(Choose two.)
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Correct answer: A, D
- 7
A mission-critical server is connected to site A. Connectivity to this server is lost from site B because the MAC route is missing in the OTV VDC of the Cisco Nexus7000 in site B due to MAC aging. Which action allows the flooding of the unknown unicast MAC on the Nexus 7000 in the OTV VDC?
Show answer details
Correct answer: C
- 8
After a vPC failover, Switch-B holds the operational primary role. To manually preempt the operational primary role back to Switch-A, an engineer changes the vPC role priority on Switch-B and then shuts down and re-enables the vPC peer link. Which role-priority change must be made on Switch-B?
Show answer details
Correct answer: B
Cisco's vPC election document says vPC roles are non-preemptive: when the primary fails, the secondary becomes operational primary, sets its sticky bit, and keeps that role after the old primary returns. The election compares the sticky bit, then the user-defined role priority (the lowest numeric value wins), then the lowest system MAC address. To make one device primary again, Cisco says to give that device the lower role priority and the other device the higher value, then shut down and re-enable the vPC peer link. So on Switch-B the role priority must be set higher than Switch-A's; changing or re-entering the role priority also clears Switch-B's sticky bit, and the peer-link flap re-runs the election in Switch-A's favor. A lower value would make Switch-B win again, and the same value would leave the result to the system MAC addresses. Source: Cisco, 'Understand the vPC Election Process' (document 212589).
