2. 计算机
  3. Which protocol below uses TCP port 443 at layer 4? A. HTML B. HTTPS C. TFTP D. Telnet E. SMTP F. None of the above

Which protocol below uses TCP port 443 at layer 4? A. HTML B. HTTPS C. TFTP D. Telnet E. SMTP F. None of the above

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问题 Which protocol below uses TCP port 443 at layer 4?
A. HTML
B. HTTPS
C. TFTP
D. Telnet
E. SMTP
F. None of the above
选项
答案B
解析 Explanation:
HTTPS is the secured version of the HTTP application, which normally uses 128 bit SSL encryption to secure the information sent and received on a web page. An example is a banking web site, or a trustworthy shopping web site that takes credit card information. It is an application layer protocol which uses TCP port 443.

Incorrect Answers:
A. HTML is not a protocol.
C. TFTP uses UDP port 69.
D. Telnet uses TCP port 23.
E. SMTP uses TCP port 25.
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