A systems administrator is preparing a standard 42U, 19-inch four-post cabinet for a new batch of identical 2U rack-mount servers. The design already reserves 6U at the top for network switches and horizontal cable managers and sets aside another 4U elsewhere in the cabinet for blank panels to maintain front-to-back airflow. Assuming no other equipment will be installed, how many of the 2U servers can the administrator install in the cabinet without exceeding its maximum usable height?
One rack unit (1U) equals 1.75 inches of vertical space, and a typical full-height cabinet provides 42U. With 6U earmarked for switching gear and 4U kept open for airflow management, 10U are unavailable, leaving 32U (42U − 10U) for servers. Dividing the remaining 32U by the 2U height of each chassis gives 16 servers. The other choices miscalculate the available rack units or the division by 2U.
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