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300-615Updated 1d ago · Sep 4, 2026

Troubleshooting Cisco Data Center Infrastructure (DCIT)

290 questions across 1 topics, with suggested answers, explanations where available, and imported community discussion. The first 29 questions are free to preview.

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Question 1 · Network Open

Refer to the exhibit. The vPC between switch1 and switch2 is not working. Which two actions resolve the issue? (Choose two.)

Question exhibit
Answer: A, D Both vPC peers must use the same vPC domain ID. The vPC peer link and peer-keepalive link must also be correctly configured and operational; an unreachable peer-keepalive destination prevents the peer relationship from forming. Cisco NX-OS requires the peer-keepalive link before the vPC peer link can form. **Learn more:** [Cisco Nexus 9000 Series NX-OS Interfaces Configuration Guide—Configuring vPCs](https://www.cisco.com/c/en/us/td/docs/dcn/nx-os/nexus9000/106x/configuration/interfaces/cisco-nexus-9000-series-nx-os-interfaces-configuration-guide-release-106x/m_configuring_vpcs_9x.html?bookSearch=true)
Question 2 · Network Open

A mission-critical server is connected to site A. Connectivity to this server from site B is lost because the MAC route is absent from the OTV VDC on the Cisco Nexus 7000 at site B as a result of MAC aging. Which action permits flooding of the unknown-unicast MAC on the Nexus 7000 in the OTV VDC?

Answer: C Cisco Nexus 7000 OTV supports selective unicast flooding with the `otv flood mac mac-address vlan vlan-id` command. It configures flooding for the specified destination MAC when the OTV MAC route is unavailable, such as after MAC aging. [Cisco Nexus 7000 Series NX-OS OTV Configuration Guide—Configuring Advanced OTV Features](https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus7000/sw/otv/config/cisco_nexus7000_otv_config_guide_8x/configuring_advanced_otv_features.html) **Learn more:** [Cisco Nexus 7000 Series NX-OS OTV Configuration Guide—Configuring Advanced OTV Features](https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus7000/sw/otv/config/cisco_nexus7000_otv_config_guide_8x/configuring_advanced_otv_features.html) · [Cisco Nexus 7000 Series NX-OS OTV Command Reference—otv flood mac](https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus7000/sw/otv/command/reference/nxos_otv_cr/basics_otv_cmds.html)
Question 3 · Network Open

A customer configures HSRP between two data centers interconnected through OTV. The configuration succeeds, but traffic between two ESXi virtual hosts at the same site is routed suboptimally through the OTV overlay. Which two actions optimize the traffic? (Choose two.)

Answer: B, E An OTV-edge Layer 3 VACL blocks HSRP control packets from crossing sites, and a Layer 2 MAC list prevents the HSRP virtual MAC from being advertised or used across the overlay. This localizes first-hop gateway behavior and keeps same-site traffic from taking an unnecessary OTV path. **Learn more:** [Cisco OTV Technology Introduction and Deployment Considerations](https://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Data_Center/DCI/whitepaper/DCI3_OTV_Intro/DCI_1.html) · [Configure Overlay Transport Virtualization with ASR 1000](https://www.cisco.com/c/en/us/support/docs/routers/asr-1000-series-aggregation-services-routers/222266-configure-overlay-transport-virtualizati.html)