|  | 9.6 | Basics of Wiring Closets and Patch Panels
| 9.6.2 | Reason for MDFs and IDFs
It is not unusual for large networks to have more than one wiring closet. Usually, when this occurs, one wiring closet is designated as the main distribution facility (MDF). All others, referred to as intermediate distribution facilities (IDFs), are dependent on it. A topology such as this is described as an extended star topology.
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