What Type of Traffic Flow Moves Laterally Between VMs?

Why the Answer Is Correct

East-west traffic specifically denotes data movement between systems within the same data center, cloud environment, or local subnet. The question’s keywords “same subnet,” “VMs,” and “moving laterally” directly align with industry standards for internal server-to-server communication. This pattern contrasts with north-south traffic, which crosses the perimeter to reach external clients or the internet. Modern virtualized environments heavily utilize east-west routing for microservices, database replication, and internal API calls.

Why the Other Options Are Wrong

Point-to-point describes a dedicated logical or physical link between two devices but does not define the broader architectural traffic pattern. Horizontal-scaling refers to adding more machines to a pool to increase capacity, not the direction or classification of network flows. Hub-and-spoke is a topology design where a central device connects multiple peripheral nodes, typically used for WAN or branch connectivity rather than intra-subnet VM communication. None of these options capture the lateral, internal nature emphasized in the scenario.

Community Comment Notes

Contributors consistently highlight “laterally” as the critical keyword that points directly to east-west traffic [Comment 2]. Several users reinforce that east-west encompasses all internal data center activity, including switch, firewall, and router interactions [Comment 1]. The unanimous voting and concise explanations demonstrate strong community agreement on this foundational networking concept.