Which packets are counted after the atomic counters are configured?

Question

Options

• Apackets that are switched in the hypervisors
• Bpackets that are locally switched
• Cpackets that are switched via AVS
• Dpackets that traverse the fabric

• A
  93% (26)
• B
  4% (1)
• C
  4% (1)

Explanation

Atomic counters in Cisco ACI are designed to measure traffic between endpoint groups (EPGs) at the hypervisor level, specifically counting packets that are switched within the hypervisors - meaning traffic handled by the virtual switching layer (such as AVS) running inside the compute nodes, not traffic that has already exited to the physical fabric.

Why the distractors are wrong:

• B (locally switched): "Locally switched" refers to traffic switched at a single leaf without traversing the fabric - this is a physical switching concept, not what atomic counters target.
• C (switched via AVS): AVS (Application Virtual Switch) is one specific implementation of hypervisor switching; the correct, broader answer is all hypervisor-switched packets, not AVS alone.
• D (traverse the fabric): Fabric-traversing packets pass between leaf nodes - atomic counters are not configured to count inter-leaf fabric traffic.

Memory tip: Think of "atomic" as drilling down to the smallest unit - the hypervisor is where individual VM traffic originates, so atomic counters capture it there, before it ever reaches the physical fabric. If you remember "atomic = hypervisor-level granularity," option A becomes intuitive.

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