SK0-004 · Question #96
Which of the following describes a rack mounted server that is 2 rack units (2U) in height?
The correct answer is C. 3.5 inches (8.89 cm). One rack unit (1U) equals 1.75 inches per the EIA-310 standard, so a 2U server measures exactly 3.5 inches (8.89 cm) in height.
Question
Which of the following describes a rack mounted server that is 2 rack units (2U) in height?
Options
- A2.5 inches (6.35 cm)
- B3.0 inches (7.62 cm)
- C3.5 inches (8.89 cm)
- D4.0 inches (10.16 cm)
How the community answered
(27 responses)- B7% (2)
- C89% (24)
- D4% (1)
Why each option
One rack unit (1U) equals 1.75 inches per the EIA-310 standard, so a 2U server measures exactly 3.5 inches (8.89 cm) in height.
2.5 inches does not correspond to any integer multiple of the 1.75-inch rack unit standard and falls between the valid 1U (1.75 in) and 2U (3.5 in) heights.
3.0 inches does not align with any standard rack unit multiple defined by EIA-310 and is not a recognized rack server height.
The EIA-310 standard defines one rack unit as 1.75 inches (44.45 mm), and a 2U chassis is simply twice that height, yielding exactly 3.5 inches (88.9 mm). This standard governs all 19-inch rack-mounted equipment to ensure interoperability between servers, switches, and other rack components from different vendors.
4.0 inches exceeds the correct 2U measurement of 3.5 inches and is not a standard rack height, as the next integer multiple would be 3U at 5.25 inches.
Concept tested: EIA-310 rack unit height standard for server form factors
Source: https://www.cisco.com/c/en/us/td/docs/unified_computing/ucs/hw/chassis-install-guide/b_Cisco_UCS_5108_Install_Guide.html
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