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5V0-42.21 · Question #30

Which statement describes a characteristic of VMware SU-WAN Edge (VCL) clustering?

The correct answer is C. VCF clusters member sync flow tables between themselves. C is correct because VMware SD-WAN Edge (VCE) cluster members actively synchronize their flow tables with each other. This stateful synchronization is the core feature that enables seamless traffic failover - if one cluster member fails, another can continue handling existing…

SD-WAN Architecture and Technologies

Question

Which statement describes a characteristic of VMware SU-WAN Edge (VCL) clustering?

Options

  • AOne VCE cluster can be formed with both virtual and hardware at the same lime
  • BA VCE cluster requires one dedicated interface for HA sync
  • CVCF clusters member sync flow tables between themselves.
  • DVCE cluster members should have unique IP addresses on its WAN interfaces

How the community answered

(26 responses)
  • A
    4% (1)
  • B
    15% (4)
  • C
    69% (18)
  • D
    12% (3)

Explanation

C is correct because VMware SD-WAN Edge (VCE) cluster members actively synchronize their flow tables with each other. This stateful synchronization is the core feature that enables seamless traffic failover - if one cluster member fails, another can continue handling existing sessions without dropping connections, because it already has the flow state.

Why the distractors are wrong:

  • A is incorrect because VCE clusters must be homogeneous - you cannot mix virtual and hardware Edges in the same cluster.
  • B is incorrect because VCE clustering does not require a dedicated interface for HA sync; sync traffic uses existing interfaces.
  • D is incorrect because cluster members on WAN interfaces share the same IP address (a cluster VIP), not unique ones - shared IP is what makes them appear as a single logical device to the upstream network.

Memory tip: Think of VCE clustering as a "hive mind" - the defining trait is that members share knowledge (flow tables) in real time, which is what makes stateful failover possible. If a question asks what makes clustering work, the answer is always the sync.

Topics

#VCE Clustering#Flow Table Synchronization#High Availability#SD-WAN Architecture

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