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單項(xiàng)選擇題

An administrator needs to install a 2U server into a rack. Which of the following shows how much space， in height， needs to be available for the server to fit in the rack？（）

A.1.75 inches（4.45 cm）
B.2.5 inches（6.35 cm）
C.3.5 inches（8.89 cm）
D.4.25 inches（10.8 cm）

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A technician is troubleshooting a lack of Internet connectivity affecting their entire office. The technician suspects the issue is with their Internet Service Provider failing to provide service.Which of the following command line tools should the technician use to BEST test this theory？（）

A.tracert
B.ipconfig
C.netstat
D.nslookup

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A small business has had unauthorized people enter their server room and damage their servers.Which of the following locks for the door would BEST prevent unauthorized people from accessing the server room？（）

A.Biometric
B.Keypad
C.Barcode
D.Key lock