Cisco 300-640 Certification Sample Questions and Answers

Cisco 300-640 sample questions for Cisco Certified Specialist - Data Center AI Infrastructure preparationThe Cisco 300-640 Certification Sample Questions on this page help you become familiar with the question style and knowledge areas of the Cisco Certified Specialist - Data Center AI Infrastructure (DCAI) exam. Each question is written to reflect the syllabus topics and the level of understanding the certification expects, so you can see how theoretical concepts are tested in practice. Working through them lets you check your understanding, identify topics that need further study, and get comfortable interpreting certification-style questions before you sit the official exam.

These free sample questions are a useful starting point, but they cover only a small part of complete preparation. Reading the documentation, completing recommended training, and gaining hands-on experience build the underlying knowledge required for the certification. Structured practice then shows how well you can recall and apply that knowledge to exam-oriented questions, and reviewing the explanation for each answer helps you understand why a particular option is correct. As your preparation progresses, timed practice helps you develop pacing, sharpen question interpretation, and make confident decisions under exam conditions. Combining these approaches over several study sessions gives you a realistic measure of your readiness ahead of the Cisco Certified Specialist - Data Center AI Infrastructure exam.

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Cisco 300-640 (DCAI) Sample Questions:

01. In Nexus Dashboard Fabric Controller (NDFC), which deployment "Persona" is specifically optimized for managing the leaf-spine fabrics typically used in AI PODs?
a) LAN Fabric
b) IP Fabric for Media
c) SDN Fabric (ACI)
d) SAN Controller
 
02. An organization is using Cisco Intersight to manage a globally distributed AI infrastructure. Which feature allows them to automate the deployment of OS-level drivers and NVIDIA libraries across all nodes?
a) Intersight Mobile App
b) Intersight Search
c) Intersight Virtual Appliance
d) Intersight Cloud Orchestrator (ICO)
 
03. When configuring a storage policy for an AI cluster in Cisco Intersight, which setting ensures that the UCS server can utilize NVMe over Fabrics (NVMe-oF) for high-speed data ingestion?
a) Enabling "Local Disk Mirroring"
b) Configuring an "FC-NVMe" or "NVMe over RoCE" interface in the Storage Policy
c) Setting the disk drive speed to 15k RPM
d) Enabling "SATA AHCI" mode in the BIOS
 
04. You are designing the IP addressing for a large AI cluster using RoCEv2 across a Layer 3 leaf-spine. Why is it recommended to use a small MTU for the Control Plane but a Jumbo MTU (9000+) for the Data Plane?
a) There is no such recommendation; MTU should always be 1500.
b) Because GPUs can only read large packets.
c) Small packets are better for routing updates, while large packets maximize throughput and reduce CPU overhead for the massive AI data transfers.
d) To save money on IP addresses.
 
05. Why is Redundancy (N+1 or 2N) more complex in AI clusters than in standard web-tier clusters?
a) AI jobs are stateful and long-running; a single node failure can crash a month-long training job.
b) AI nodes don't use IP addresses.
c) GPUs don't support power redundancy.
d) AI traffic is only one-way.
 
06. A 32-node AI training job has slowed down significantly. An engineer checks the Nexus switch counters and sees a high number of PFC Rx Pause frames on the ports connected to the leaf switches, but zero drops. What is the most likely cause?
a) The fabric is dropping packets due to a hardware failure.
b) The spine switches are congested and are pushing "back-pressure" toward the leaves.
c) The GPUs have stopped sending data.
d) The VLANs are incorrectly configured.
 
07. In a Hybrid AI deployment, which Cisco solution would be used to provide secure, high-speed connectivity between an on-premises Nexus fabric and a VPC in AWS?
a) Cisco SD-WAN or Cloud Router (CSR/Catalyst 8000V)
b) Cisco Umbrella
c) Cisco Duo
d) Cisco AnyConnect (Standard VPN)
 
08. Which AI use case is specifically designed to detect anomalies in network traffic patterns to prevent zero-day exploits?
a) Predictive Maintenance
b) Natural Language Processing (NLP)
c) AI-driven Cybersecurity
d) Computer Vision
 
09. What is the role of a Vector Database in a RAG architecture?
a) It stores the weights of the neural network.
b) It stores high-dimensional "embeddings" of data for fast similarity searches.
c) It acts as the primary DHCP server for the GPUs.
d) It manages the power distribution units (PDUs).
 
10. During which phase of the AI lifecycle would a data engineer perform "Feature Engineering" and "Data Labeling"?
a) Model Monitoring
b) Data Preparation
c) Model Evaluation
d) Model Deployment

Answers:

Question: 01

Answer: a

Question: 02

Answer: d

Question: 03

Answer: b

Question: 04

Answer: c

Question: 05

Answer: a

Question: 06

Answer: b

Question: 07

Answer: a

Question: 08

Answer: c

Question: 09

Answer: b

Question: 10

Answer: d

For broader timed practice across the Cisco DCAI certification objectives, explore the Premium Cisco 300-640 Practice Exam. It complements your study resources by giving you repeated opportunities to apply what you have learned under exam-oriented conditions.

For the latest exam objectives, certification requirements, registration information, and vendor updates, refer to the official 300-640 exam page.

Note: These are independently developed practice questions created for study and familiarization. They are not official Cisco exam questions or recalled content from a live certification exam. If you find a typo or data entry error in these Implementing Cisco Data Center AI Infrastructure (300-640) sample questions, please let us know at feedback@nwexam.com.

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