Which term describes an approach based on starting a network design from the topmost layer and moving down?

• A. Top Down Approach
• B. Topology Table
• C. Top-Level Domain (TDL)
• D. Throughput Tester

Answer: (A)

Starting from the highest layer and moving downward describes a top-down approach in network design. This method begins with broad requirements at the top—such as business goals, applications to support, security and QoS needs—and uses those to shape the architecture, then progressively defines lower-layer details like services, protocols, networks, and physical infrastructure to meet those requirements. It ensures the design stays aligned with what users and the organization actually need, making it easier to validate that each layer delivers necessary capabilities. The other terms aren’t about design sequencing: a topology table simply records network connections, a top-level domain is a DNS concept, and a throughput tester is a tool for measuring performance rather than a design approach.