CDCP Question #39: Real Exam Question with Answer & Explanation

The correct answer is C. 1.75 inches (4.445 cm). The height of 1";"; (rack unit) or "RU" (rack unit) is standardized at 1.75 inches, which is equivalent to 44.45 millimeters or 4.445 centimeters. This unit of measurement is globally used to define the internal mounting space in IT and telecommunications racks. Equipment manufac

Question

When referring to the internal mounting space in racks, equipment manufactures generally refer to standardized height of electronic modules "U" or "RU". What is the height of 1 "U" or "RU"?

Options

A19 inches (60 cm)
B24 inches (80 cm)
C1.75 inches (4.445 cm)
D3.5 inches (8.59 crn)

Explanation

The height of 1";"; (rack unit) or "RU" (rack unit) is standardized at 1.75 inches, which is equivalent to 44.45 millimeters or 4.445 centimeters. This unit of measurement is globally used to define the internal mounting space in IT and telecommunications racks. Equipment manufacturers specify their devices' height based on how many "U" the device occupies (for example, a 2U server is 3.5 inches high). The standardization ensures interoperability and planning efficiency within the data center environment. The "U" (rack unit) system is essential for ensuring that racks and equipment from different manufacturers will fit together properly, facilitating modularity, expansion, and maintenance. The 1.75-inch specification is defined by several industry standards including EIA-310 and is referenced directly in the EPI CDCP training and its official exam preparation guides.

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