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- Exam Name: Implementing Cisco Data Center AI Infrastructure (DCAI)
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Cisco 300-640 - Implementing Cisco Data Center AI Infrastructure (DCAI)
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Total Questions: 60
Free Practice Questions: 36
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?
Answer
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D
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Explanation
RoCEv2 transports the InfiniBand transport protocol over UDP/IP, allowing RDMA traffic to traverse Layer 3 networks. The RDMA transport layer preserves packet-level sequencing, reliability, and ordering semantics that are inappropriate for arbitrary IP fragmentation. Consequently, RoCEv2 traffic is designed to traverse the network without IP fragmentation, making option D the intended technical answer. NVIDIA documentation confirms that RoCEv2 places the InfiniBand transport protocol behind UDP and IP rather than using the native InfiniBand network-layer header. A consistent end-to-end MTU is therefore essential in GPU fabrics. AI clusters commonly use jumbo frames, and every switch interface, port channel, Layer 3 interface, and server NIC along the path must support the configured packet size. Unexpected fragmentation is incompatible with the deterministic behavior required by high-performance RDMA workloads. Option A identifies a general IPv4 consequence of setting DF—Path MTU Discovery can use DF—but it is not the fundamental RoCE transport requirement tested here. Option B is incorrect because DF does not classify packets as RDMA. Option C is also incorrect because ECMP path selection is normally determined by packet-header hashing; the DF flag does not force packets onto a single path. Study Guide Reference: AI Infrastructure Deployment and Data Management — RoCEv2, MTU design, lossless transport, and high-performance Ethernet. =============== |
Which type of Cisco Intersight profile, when deployed to fabric interconnects, includes the configuration settings for ports, VLANs, and VSANs?
Answer
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C
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Explanation
A UCS Domain Profile provides the configuration model for a pair of Cisco UCS Fabric Interconnects operating in Intersight Managed Mode. Cisco explicitly states that the Domain Profile allows configuration of FI ports and port channels and defines the VLANs and VSANs used by the domain. This makes option C an exact match for the functionality described. The Domain Profile references reusable policies rather than embedding every setting directly. VLAN and VSAN policies are associated during the VLAN and VSAN configuration stage, Port Policies are assigned during port configuration, and additional management or compute-related domain policies are attached subsequently. When the Domain Profile is deployed, Intersight applies the assembled configuration to the assigned Fabric Interconnect domain. A Chassis Profile configures chassis-specific properties and cannot replace domain-level network configuration. A Server Profile configures an individual server's identity, boot configuration, vNICs, vHBAs, firmware, BIOS, storage, and similar server-specific characteristics. Unified Edge uses its own distributed edge management model and is not the FI configuration object in question. This distinction is fundamental in Intersight Managed Mode: Domain Profiles configure the Fabric Interconnect domain, while Server Profiles configure individual compute resources attached to that domain. Study Guide Reference: AI Infrastructure Deployment and Data Management — Cisco Intersight, UCS Domain Profiles, VLAN/VSAN policies, and port configuration. =============== |
An engineer configures quality of service in the Cisco ACI fabric to connect VAST storage servers.
Which combination of attributes must be selected?
Answer
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A
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Explanation
Cisco's validated guidance for connecting VAST Data storage through an ACI fabric explicitly configures the RDMA storage class with Weighted Random Early Detection and Congestion Notification enabled . This makes option A directly consistent with Cisco's documented configuration. In Cisco's VAST Data ACI design example, storage traffic arrives marked with DSCP 26 and is assigned to the Level2 QoS class. PFC is enabled for the corresponding no-drop DSCP, bandwidth is reserved for storage traffic, the congestion algorithm is configured as WRED, and congestion notification is enabled. WRED and ECN-style congestion notification work together to detect developing queue pressure before buffers overflow. Rather than waiting for tail-drop conditions, the network can mark congestion-capable traffic so RoCEv2 endpoints reduce their transmission rates. PFC provides the complementary no-drop behavior when congestion becomes sufficiently severe. Option B disables the required congestion signaling. Options C and D use Tail Drop, which Cisco's documented VAST RDMA storage class does not use. Tail Drop is instead shown in the same Cisco design for control-plane and ordinary traffic classes where lossless RDMA behavior is not required. This configuration is therefore not merely a generic QoS preference; it directly follows Cisco's published ACI-to-VAST storage design. Study Guide Reference: AI Infrastructure Deployment and Data Management — QoS, ECN/WRED, PFC, RDMA storage, and lossless fabric configuration. |
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Cisco 300-640 FAQ'S
Find answers to the most common questions about the Cisco 300-640 exam, including what it is, how to prepare, and how it can boost your career.
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