300-640考試重點 - 300-640 PDF
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最新的 CCNP Data Center 300-640 免費考試真題 (Q20-Q25):
問題 #20
An engineer configures quality of service in the Cisco ACI fabric to connect VAST storage servers. Which combination of attributes must be selected?
- A. Congestion Algorithm: Weighted Random Early Detection (WRED)
Congestion Notification: Enabled - B. Congestion Algorithm: Weighted Random Early Detection (WRED)
Congestion Notification: Disabled - C. Congestion Algorithm: Tail Drop
Congestion Notification: Enabled - D. Congestion Algorithm: Tail Drop
Congestion Notification: Disabled
答案:A
解題說明:
VAST storage integration in a Cisco ACI fabric requires QoS settings that support lossless, congestion-aware Ethernet behavior. Weighted Random Early Detection with congestion notification enabled allows the fabric to signal congestion early through ECN before buffer exhaustion occurs, helping maintain predictable performance for high-throughput storage traffic.
問題 #21
A customer uses Cisco AI Products within Intersight and observes packet drops for RoCEv2 traffic. Which System QoS policy configuration must be deployed to ensure that RoCEv2 traffic is classified as lossless?
- A. Enable Platinum class and uncheck Allow Packet Drops.
- B. Disable Gold system class.
- C. Disable Platinum system class.
- D. Enable all QoS system classes.
答案:A
解題說明:
RoCEv2 traffic must be mapped to a lossless system class. Enabling the Platinum class and clearing Allow Packet Drops configures that class as lossless, preventing packet drops for RoCEv2 traffic and supporting reliable RDMA communication for AI workloads.
問題 #22
A network team is configuring quality of service (QoS) for RoCEv2 traffic on a VXLAN fabric. The team must ensure that congestion notification packets (CNP) generated by storage targets are never dropped in the network, as these packets are critical for congestion control feedback. How must CNP packets be handled in the QoS configuration to ensure reliable delivery?
- A. Classify CNP packets to a high-priority queue using their DSCP marking.
- B. Configure CNP packets to use the same queue as regular RoCEv2 data traffic.
- C. Apply traffic shaping to CNP packets to prevent them from causing additional congestion.
- D. Enable Priority Flow Control specifically for CNP packets on a dedicated CoS value.
答案:A
解題說明:
CNP packets provide congestion feedback for RoCEv2 traffic and must be delivered reliably so senders can reduce their transmission rate when congestion is detected. Classifying CNP packets into a high-priority queue based on their DSCP marking ensures that these control packets receive preferential treatment and are not dropped during congestion.
問題 #23
A data center is deploying an AI infrastructure for LLM training and model inference. This infrastructure requires high GPU density, low-latency interconnects, and the ability to scale compute resources. When considering the Cisco UCS C885A M8 Rack Server for the deployment, which design aspect is the most critical for achieving optimal performance and scalability in this environment?
- A. configuring the server with the minimum amount of RAM to reduce initial costs
- B. using the maximum number of CPU cores to support the virtualization overhead
- C. implementing a redundant power supply configuration to ensure high availability
- D. selecting the appropriate Nexus Fabric and its configuration to minimize latency
答案:D
解題說明:
For UCS C885A M8 servers running LLM training and inference workloads, the surrounding Nexus fabric design is critical because GPU-dense systems depend on low-latency, high- bandwidth, lossless network connectivity for scale-out performance. Selecting and configuring the correct Nexus fabric minimizes communication delays between compute nodes and enables the AI infrastructure to scale efficiently.
問題 #24
Drag and Drop Question
A network engineer is designing congestion management for an AI cluster using RoCEv2 transport. Based on Cisco best practices, the engineer must understand how ECN and PFC work together to provide lossless Ethernet transport. Drag and drop the congestion management mechanisms from the left onto the corresponding descriptions on the right. Not all options are used.
答案:
解題說明:
問題 #25
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