2. 计算机
  3. Which of the protocols below use TCP at the transport layer? (Select four) A. TFTP B. SMTP C. SNMP D. FTP E. HTTP F. HTTPS

Which of the protocols below use TCP at the transport layer? (Select four) A. TFTP B. SMTP C. SNMP D. FTP E. HTTP F. HTTPS

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问题 Which of the protocols below use TCP at the transport layer? (Select four)
A. TFTP
B. SMTP
C. SNMP
D. FTP
E. HTTP
F. HTTPS
选项
答案B,D,E,F
解析 Explanation:
SMTP (Simple Mail Transfer Profile for email), FTP (File Transfer Protocol), and HTTP/HTTPS (Hyper Text Transfer Protocol for internet) all use TCP because of the reliable delivery mechanism. SMTP uses TCP port 25, FTP uses TCP ports 20 and 21, HTTP uses TCP port 80, and HTTPS uses TCP port 443.

Incorrect Answers:
A, C: SNMP and TFTP use UDP as the transport mechanism. Generally speaking, protocols that use the keywords "trivial" or "simple" uses UDP, since connectionless, best effort delivery mechanism usually suffice.
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