Which of the following services use TCP? (Choose three) A. DHCP B. SMTP C. SNMP D. FTP E. HTTP F. TFTP

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问题 Which of the following services use TCP? (Choose three)
A. DHCP
B. SMTP
C. SNMP
D. FTP
E. HTTP
F. TFTP

选项

答案B,D,E

解析 Explanation:
TCP (Transmission Control Protocol) is a reliable mechanism for data delivery. SMTP, FTP and HTTP services use TCP via ports 25, 20/21, and 80, respectively.

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