Exam 3V0-12.26 Topic 1 Question 55 Discussion
Actual exam question for VMware's 3V0-12.26 exam
Question #: 55
Topic #: 1
Question #: 55
Topic #: 1
An enterprise architect is designing the physical networking architecture for a greenfield VMware Cloud Foundation (VCF) deployment in a single data center. The deployment includes a management domain and multiple workload domains, utilizing NSX for software-defined networking with Geneve overlay encapsulation. NSX Edge nodes will handle North/South routing and services.
Requirements:
* Scalable, non-blocking fabric with predictable oversubscription and low latency.
* Support for high-throughput traffic including vSAN, vMotion, and NSX overlay.
* End-to-end jumbo frame support for efficiency.
* No dependency on physical multicast routing or snooping for overlay (BUM) Broadcast, Unknown- unicast, and Multicast replication.
* Redundant connectivity from hosts to the fabric.
Constraints:
* Existing Top-of-rack switches are limited to 25 GbE host-facing ports.
* The physical network does not support multicast.
* Future expansion to multiple racks and higher port speeds (25/100 GbE) is anticipated.
What are the four design decisions that fit the architecture ' s physical design? (Choose four.)
Requirements:
* Scalable, non-blocking fabric with predictable oversubscription and low latency.
* Support for high-throughput traffic including vSAN, vMotion, and NSX overlay.
* End-to-end jumbo frame support for efficiency.
* No dependency on physical multicast routing or snooping for overlay (BUM) Broadcast, Unknown- unicast, and Multicast replication.
* Redundant connectivity from hosts to the fabric.
Constraints:
* Existing Top-of-rack switches are limited to 25 GbE host-facing ports.
* The physical network does not support multicast.
* Future expansion to multiple racks and higher port speeds (25/100 GbE) is anticipated.
What are the four design decisions that fit the architecture ' s physical design? (Choose four.)
Suggested Answer: A,B,C,F Vote an answer
The design requires a scalable routed fabric, high bandwidth, redundant host connectivity, jumbo frames, and no physical multicast dependency .
A satisfies the end-to-end jumbo-frame requirement. VCF guidance requires consistent MTU configuration throughout the complete path; Broadcom specifically notes that jumbo frames increase throughput and that the physical and virtual path must support the configured MTU. Geneve encapsulation also adds overhead, making sufficient MTU headroom essential.
B is correct because NSX head-end replication replicates BUM frames in software from the originating transport node and therefore does not require multicast support in the physical underlay.
C best satisfies the high-throughput and redundancy requirements. Dual 25-GbE NICs provide substantial bandwidth for consolidated vSAN, vMotion, management, and overlay traffic while allowing redundant attachment to separate ToR switches. Broadcom specifically recommends higher-speed networking for demanding vSAN environments.
F provides the required scalable physical fabric. A Layer-3 leaf-spine/CLOS topology using BGP and ECMP delivers predictable latency, multiple equal-cost paths, horizontal rack expansion, and eliminates dependence on large Layer-2 failure domains.
D conflicts directly with the no-multicast constraint, E provides less bandwidth than the design target, and G introduces unnecessary Layer-2 extension rather than a scalable routed underlay.
Study Guide References/Topics: VCF Physical Network Design; Leaf-Spine/CLOS Architecture; BGP and ECMP; NSX Geneve Overlay; BUM Replication; Jumbo Frames; vSAN Network Design; ESX Host Uplink Redundancy.
A satisfies the end-to-end jumbo-frame requirement. VCF guidance requires consistent MTU configuration throughout the complete path; Broadcom specifically notes that jumbo frames increase throughput and that the physical and virtual path must support the configured MTU. Geneve encapsulation also adds overhead, making sufficient MTU headroom essential.
B is correct because NSX head-end replication replicates BUM frames in software from the originating transport node and therefore does not require multicast support in the physical underlay.
C best satisfies the high-throughput and redundancy requirements. Dual 25-GbE NICs provide substantial bandwidth for consolidated vSAN, vMotion, management, and overlay traffic while allowing redundant attachment to separate ToR switches. Broadcom specifically recommends higher-speed networking for demanding vSAN environments.
F provides the required scalable physical fabric. A Layer-3 leaf-spine/CLOS topology using BGP and ECMP delivers predictable latency, multiple equal-cost paths, horizontal rack expansion, and eliminates dependence on large Layer-2 failure domains.
D conflicts directly with the no-multicast constraint, E provides less bandwidth than the design target, and G introduces unnecessary Layer-2 extension rather than a scalable routed underlay.
Study Guide References/Topics: VCF Physical Network Design; Leaf-Spine/CLOS Architecture; BGP and ECMP; NSX Geneve Overlay; BUM Replication; Jumbo Frames; vSAN Network Design; ESX Host Uplink Redundancy.
by Mandel at Oct 01, 2026, 08:46 AM
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