Web protocols: which well-known TCP/UDP port number is assigned to HTTP (Hypertext Transfer Protocol) for standard web traffic?

Difficulty: Easy

99
86
80
23
None of the above

Correct Answer: 80

Explanation:

Introduction / Context:
Application protocols are commonly associated with specific port numbers to simplify configuration and interoperability. Knowing the default port for HTTP helps with firewall rules, URL construction, and basic troubleshooting of web services.

Given Data / Assumptions:

We refer to the default, well-known port (not alternative ports).
HTTP is distinct from HTTPS (which uses a different port by default).
We assume standard IANA assignments.

Concept / Approach:
The default port for HTTP is 80/TCP. While HTTP can technically run on other ports, port 80 is the conventional and well-known assignment. (For comparison, HTTPS uses 443/TCP; Telnet uses 23/TCP.)

Step-by-Step Solution:

Recall the standard port mappings: HTTP → 80.Match to the list of choices and select 80.Note that option 23 corresponds to Telnet, not HTTP.

Verification / Alternative check:
Accessing ‘‘http://host/’’ implicitly connects to port 80 unless a different port is specified.

Why Other Options Are Wrong:

99, 86: not the well-known HTTP ports.23: Telnet's port, not HTTP.None of the above: incorrect because 80 is correct.

Common Pitfalls:
Confusing HTTP (80) with HTTPS (443); assuming the presence of a port in a URL implies HTTPS automatically.

Web protocols: which well-known TCP/UDP port number is assigned to HTTP (Hypertext Transfer Protocol) for standard web traffic?

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