New Launch 300-640 Questions (PDF) [2026] - Cisco 300-640 Exam Dumps

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Cisco 300-640 Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: AI Infrastructure Fundamentals	15%	- GPU Architecture and Types - AI Infrastructure Requirements - AI Workload Characteristics - AI Ecosystem Components
Topic 2: AI Infrastructure Security and Compliance	10%	- Compliance Considerations - Security Best Practices - Access Control and Authentication
Topic 3: Cisco AI Infrastructure Architecture	30%	- Network Architecture for AI Workloads - Cisco UCS AI Infrastructure Solutions - Storage Architecture Considerations - Hyperconverged Infrastructure for AI
Topic 4: AI Infrastructure Operations	20%	- Performance Optimization - Monitoring and Management Tools - Troubleshooting Common Issues - Capacity Planning
Topic 5: AI Infrastructure Deployment	25%	- Storage Configuration for AI - Cabling and Connectivity - Network Switch Configuration - GPU Server Configuration - Hardware Installation and Configuration

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Cisco Implementing Cisco Data Center AI Infrastructure Sample Questions (Q79-Q84):

NEW QUESTION # 79
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 enable Path MTU Discovery so that the optimal packet size can be negotiated
D. to prevent IP fragmentation that would break the InfiniBand sequence numbering and ordering guarantees

Answer: D

Explanation:
RoCEv2 carries InfiniBand transport semantics over UDP/IP, and IP fragmentation would disrupt the expected packet sequencing and ordering behavior required by RDMA. Setting the Don't Fragment bit prevents intermediate devices from fragmenting RoCEv2 packets, preserving reliable RDMA transport behavior across the AI training fabric.

NEW QUESTION # 80
An engineer made changes to the corporate DNS, which caused a Cisco UCS X-Series domain to lose connectivity to Intersight. To restore connectivity, the management interface DNS and NTP settings must be updated using the device console UI. Which configuration change must be made in Intersight to allow the updated DNS configuration to persist?

A. Create a device connector policy and apply it to the blade chassis.
B. Create a network connectivity policy and apply it to the blade chassis.
C. Edit the domain profile deployed to the fabric interconnect.
D. Edit the IMC access policy associated to the fabric interconnects.

Answer: C

Explanation:
In Cisco Intersight Managed Mode, the fabric interconnect management DNS and NTP settings are controlled through the UCS domain profile. If the settings are changed locally from the device console UI, the deployed domain profile must also be updated in Intersight so the corrected configuration is not overwritten during the next policy deployment or compliance remediation.

NEW QUESTION # 81
What is a function of NVLink technology within a high-performance AI server or cluster?

A. to provide a high-speed, low-latency direct interconnect for GPU-to-GPU communication
B. to establish a secure, encrypted channel for data transfer between the AI server and external storage
C. to enable remote access and virtualization of GPU resources for distributed AI development teams
D. to manage power distribution and thermal regulation across all installed GPU units

Answer: A

Explanation:
NVLink provides a high-bandwidth, low-latency direct interconnect between GPUs. In AI servers and clusters, it accelerates GPU-to-GPU communication for training and inference workloads by allowing GPUs to exchange data much faster than through standard PCIe paths.

NEW QUESTION # 82
Server administrators receive reports of power utilization being near capacity across multiple UCS X-Series servers in the data center after a hardware upgrade. The chassis operates with six power supply units in redundant power mode. How can the administrator use additional power without impacting redundancy?

A. Enable extended power capacity.
B. Add more power supplies.
C. Implement a power capping policy.
D. Disable extended power capacity.

Answer: A

Explanation:
Extended power capacity allows a UCS X-Series chassis with six power supplies in redundant mode to make additional power available while still preserving redundancy. This is used when power demand increases after hardware upgrades and the administrator needs more usable power without changing the redundant power configuration.

NEW QUESTION # 83
A Cisco Nexus switch participates in an AI cluster using ECMP forwarding. Several flows between GPU servers consistently use the same uplink, creating congestion while other links remain underutilized. Which action improves traffic distribution?

A. Disable hashing
B. Increase MTU size
C. Enable port security
D. Modify the hashing algorithm

Answer: D

Explanation:
ECMP relies on hashing algorithms to distribute traffic across equal-cost paths. In AI environments, large elephant flows may hash to the same uplink, causing imbalance. Adjusting the hashing method improves entropy and distributes flows more evenly. Increasing MTU improves efficiency but does not rebalance traffic. Port security and disabling hashing are unrelated to load distribution.

NEW QUESTION # 84
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