A company is planning to deploy high-availability cluster support for their servers in a collapsed core data center design. Which issue should be a concern with this design?

NIC teaming is a server-level redundancy feature that is independent of the data center switching topology and does not represent a design concern specific to collapsed core architectures.

MAC address aging is a normal, tunable switch function that applies equally to all switching topologies and is not a specific concern introduced by the collapsed core design.

Layer 3 domain sizing relates to routing boundaries and IP subnet design, but HA clustering does not require Layer 3 adjacency - it requires Layer 2 adjacency, making Layer 3 domain sizing a secondary concern here.

High-availability cluster solutions require all cluster nodes to share a common Layer 2 broadcast domain for heartbeat and failover communication. In a collapsed core design, the distribution and core layers are merged, which can result in very large Layer 2 domains spanning the entire data center. Oversized Layer 2 domains introduce excessive broadcast traffic, spanning tree complexity, and an increased failure blast radius.