A Main Distribution Frame (MDF) provides a principal telecommunications distribution location for a building or campus network.
It commonly houses core or distribution switching infrastructure, fiber termination equipment, WAN connectivity, and other centralized network components.
An Intermediate Distribution Frame (IDF) provides connectivity between the MDF and endpoints distributed throughout a building.
IDFs typically contain access-layer switches, structured cabling termination panels, fiber uplinks, and associated equipment supporting nearby offices, rooms, or floors.
Option C most accurately expresses the functional distinction among the available choices.
The MDF frequently provides the main connection toward campus backbone or external network services, while IDFs distribute network connectivity to local user areas.
However, the definition should not be interpreted as requiring every campus network to egress through a single MDF. Actual routing and external connectivity depend on the selected physical and logical architecture.
Option A is incorrect because IDFs commonly connect to MDFs.
Option B incorrectly describes these terms as regional naming conventions.
Option D is incorrect because physical room size does not define MDF or IDF functionality.
The architect should document MDF/IDF locations, cabling distances, rack capacity, power, cooling, security, and redundancy before developing the physical network topology.
Official HPE Reference: HPE Aruba Networking Campus Design Validated Solution Guide — Two-Tier and Three-Tier LAN Topologies; Campus Reference Architectures.
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