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Cisco Implementing Cisco Data Center AI Infrastructure Sample Questions:

1. A network engineer logs into Nexus Dashboard and sees an anomaly showing that a BGP peer connection has gone down. Next to the anomaly, a yellow bubble displays "Correlated." What does Nexus Dashboard indicate by "Correlated" in this case?

A) It indicates that the Nexus Dashboard has seen this anomaly across more than one device in the fabric.
B) It indicates that this anomaly is a result of a higher-level root anomaly.
C) It indicates that the Nexus Dashboard has correlated the scope of the impact.
D) It indicates that the Nexus Dashboard has correlated this anomaly to activity by specific user account.

2. A network engineer analyzes RoCEv2 traffic flows in an AI training cluster and notices that all RoCEv2 packets have the Don't Fragment bit set in the IP header. Why must RoCEv2 set the DF bit in all packets?

A) to indicate to intermediate switches that the packet contains RDMA traffic requiring special handling
B) to prevent IP fragmentation that would break the InfiniBand sequence numbering and ordering guarantees
C) to enable Path MTU Discovery so that the optimal packet size can be negotiated
D) to ensure that packets always take the same path through ECMP routing for consistent latency

3. Which network design approach should be used to build a high-performance, nonblocking AI/ML data center fabric that supports 64 fully equipped UCS C885A nodes and provides the lowest possible latency and lossless Ethernet?

A) traditional three-tier
B) rail optimized
C) leaf-spine
D) flat Layer 2

4. An organization deploys a new AI training fabric that uses RoCEv2 for GPU communication. The network architect designs the QoS configuration to ensure reliable RDMA transport and must meet these requirements:
- Support 256 GPU servers with RDMA connectivity.
- Prevent any packet loss that causes RDMA connection failures.
- Maintain consistent low-latency communication with a target of less
than 10 microseconds.
- Use industry-standard protocols and configurations.
Which configuration ensures that RoCEv2 operates as a lossless transport?

A) Set the RDMA traffic to use the highest DSCP value to ensure priority forwarding.
B) Configure weighted fair queuing to prioritize RDMA traffic over other traffic classes.
C) Enable Priority Flow Control on the traffic class carrying RoCEv2 packets.
D) Implement traffic shaping to smooth RDMA traffic bursts and prevent congestion.

5. A company is building a network fabric for an AI training cluster that will train large language models. The cluster includes 256 GPUs distributed across 32 servers. Security requirements mandate isolation between different training projects and allowing shared access to a central storage system. Which approach provides the required security isolation and maintains optimal performance for GPU-to-GPU communication?

A) Configure QoS-based traffic steering with separate DSCP markings per project and policy-based routing to shared storage.
B) Deploy separate physical networks for each project with dedicated switches and cross-connects to shared storage.
C) Use VXLAN with separate VNIs per project and Group Policy Option to control granular access to shared storage.
D) Implement port-based VLANs for each project with router ACLs controlling storage access at the distribution layer.

Solutions: