A new firewall has recently been installed and several users are now unable to access the Internet. Which of the following ports is MOST likely being blocked?

The correct answer is C. 80. Port 80 is used for HTTP (HyperText Transfer Protocol), which is the standard protocol for web browsing. If a firewall blocks port 80, users cannot load most websites, effectively cutting off Internet access. Port 23 is Telnet, port 25 is SMTP (email sending), and port 110 is…

Networking

Question

A new firewall has recently been installed and several users are now unable to access the Internet. Which of the following ports is MOST likely being blocked?

Options

A23
B25
C80
D110

How the community answered

(30 responses)

A
3% (1)
B
7% (2)
C
80% (24)
D
10% (3)

Explanation

Port 80 is used for HTTP (HyperText Transfer Protocol), which is the standard protocol for web browsing. If a firewall blocks port 80, users cannot load most websites, effectively cutting off Internet access. Port 23 is Telnet, port 25 is SMTP (email sending), and port 110 is POP3 (email retrieval) - blocking those would affect specific services, not general Internet browsing.

Topics

#firewall#port 80#HTTP#network ports

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