When should an engineer implement a collapsed-core architecture?

for small networks with minimal need for growth. A collapsed-core architecture combines the distribution and core roles, reducing the design from three tiers to two. It is normally appropriate for small or medium campus networks where a separate core would add cost and complexity without a clear scale or resiliency benefit. Large networks with multiple remote sites usually justify a distinct core layer so backbone forwarding, summarization, and redundancy can scale cleanly. Cisco CCNA 200-301 v1.1 Network Fundamentals expects engineers to understand when the two-tier campus model is appropriate. The corrected answer is small networks with minimal need for growth. That design keeps operations simpler while still allowing access switches to connect into a combined distribution/core layer. Choosing the large-network option reverses the usual design logic.