Cisco 300-640 Exam Dumps - Actual Questions Answers

VXLAN EVPN provides scalable logical segmentation without requiring physically separate fabrics. Separate VXLAN Network Identifiers can isolate individual AI training projects, while Cisco's Group Policy Option adds a security group identifier to the VXLAN header and enables granular microsegmentation through security-group policies. This makes it possible to isolate tenant or project traffic while selectively allowing access to common services such as centralized storage.

Cisco specifically describes GPO as supporting microsegmentation within VXLAN EVPN fabrics and granular traffic control between application segments. This approach preserves a high-performance shared fabric, avoiding the operational complexity and resource inefficiency of constructing physically separate networks for every project. Cisco also positions VXLAN EVPN as an architecture for AI/ML environments requiring segmentation, secure multitenancy, and scalable high-throughput communication.

Option A provides strong isolation but wastes switching resources and complicates shared-storage connectivity. Option C relies on conventional VLAN boundaries and centralized router ACL enforcement, introducing scaling and potentially additional forwarding constraints. Option D confuses QoS classification with security segmentation; DSCP identifies service classes but is not a security-isolation mechanism.

Study Guide Reference: 2.1 Evaluate network deployment based on bandwidth, latency, scalability, and security.

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The exhibit reports etherErrStats rcvDelta for switch-B/slot-1/switch-ether/port-11 and shows that the receive-error delta has exceeded the configured threshold. This is a physical Ethernet interface error condition on Fabric Interconnect B, port 11. The first troubleshooting action should therefore target the Layer 1 components associated with that port .

Cisco troubleshooting guidance for Fabric Interconnect interfaces recommends checking the physical layer when interfaces report errors or bad packets, including verifying that transceivers are functioning correctly, cabling is intact, and optics are compatible. This establishes option C as the appropriate first action.

Option A begins at the application and compute layers even though the fault identifies a network-interface receive-error condition. Option B examines port-channel configuration, but the alarm identifies physical port 11 rather than a logical port-channel state problem. Option D would be appropriate when PFC congestion or excessive pause behavior is indicated; the exhibit instead reports Ethernet receive errors.

A disciplined troubleshooting sequence begins with the fault domain explicitly identified by telemetry. Physical errors should be eliminated before higher-layer QoS, port-channel, or application analysis is undertaken.

Study Guide Reference: AI Infrastructure Operations and Troubleshooting — UCS network faults, interface telemetry, physical-layer troubleshooting, and network performance analysis.

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The UCS X9516 X-Fabric Module provides PCIe Gen5 connectivity between supported M8 compute nodes and X580p PCIe nodes. Before enabling that connectivity, the affected compute nodes must be powered down and equipped with the appropriate UCS PCI Gen5 mezzanine cards .

Cisco identifies the UCSX-V5-PCIME rear mezzanine card as a required hardware component for X580p connectivity. The card provides PCIe Gen5 electrical lanes between each CPU and the X9516 X-Fabric modules. Cisco also specifies that companion compute-node host power must be off for insertion or removal operations involving X580p PCIe connectivity, and that X9516 modules must be installed before the X580p PCIe nodes are installed.

Therefore, powering down the affected blades and installing their required PCI mezzanine cards are the appropriate preparatory actions.

The IFMs provide normal UCS network connectivity and do not need to be powered off or disconnected from Fabric Interconnects merely to install the X-Fabric modules. Similarly, disconnecting the Device Connector is unrelated to physical PCIe fabric installation and would unnecessarily interrupt Intersight connectivity.

Study Guide Reference: AI Infrastructure Deployment and Data Management — Cisco UCS X-Series GPU expansion, X-Fabric, PCIe connectivity, and hardware deployment.

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