Which of the following is the default port for Hypertext Transfer Protocol (HTTP)?

The correct answer is C. 80. HTTP uses port 80 by default for unencrypted web traffic. This is a fundamental IANA well-known port assignment.

Network Traffic Analysis & Protocol Review

Question

Options

How the community answered

(51 responses)

A
6% (3)
B
8% (4)
C
84% (43)
D
2% (1)

Why each option

HTTP uses port 80 by default for unencrypted web traffic. This is a fundamental IANA well-known port assignment.

A23

Port 23 is assigned to Telnet, a legacy remote terminal access protocol, not HTTP.

B21

Port 21 is assigned to FTP (File Transfer Protocol) for control channel connections, not HTTP.

C80Correct

Port 80 is the IANA-assigned well-known port for HTTP. Web browsers connect to port 80 by default when accessing http:// URLs, and web servers listen on this port unless explicitly reconfigured to another value.

D25

Port 25 is assigned to SMTP (Simple Mail Transfer Protocol) for email relay, not HTTP.

Concept tested: IANA well-known TCP port assignments

Source: https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml

Topics

#HTTP#port 80#well-known ports#application protocols

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