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Cisco 300-640 Exam Syllabus Topics:

Cisco Implementing Cisco Data Center AI Infrastructure Sample Questions:

Question 1

Which IP-based storage transport supports flow control between directly connected devices?

A. iSCSI
B. NVMe/TCP
C. Fibre Channel
D. NVMe/RoCE

Question 2

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

Question 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. rail optimized
B. flat Layer 2
C. leaf-spine
D. traditional three-tier

Question 4

A Cisco AI infrastructure requires fast convergence after a spine switch failure. Which routing design principle best supports this objective?

A. Layer 2 loop dependency
B. Equal-cost multipath routing
C. Single-path forwarding
D. Static route redistribution

Question 5

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 ensure that packets always take the same path through ECMP routing for consistent latency
C. to prevent IP fragmentation that would break the InfiniBand sequence numbering and ordering guarantees
D. to enable Path MTU Discovery so that the optimal packet size can be negotiated

Solutions: