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單項選擇題

Which of the following is a connectionless transport layer protocol？（）

A. TCP
B. HTTP
C. SMTP
D. UDP

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單項選擇題

Which of the following is a connection oriented transport layer protocol？（）

A. TCP
B. UDP
C. TFTP
D. SNMP

單項選擇題

A server will not power on. Which of the following devices should the administrator use FIRST to determine the problem？（）

A. Loop back plugs
B. Power supply tester
C. System logs
D. TDR

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