SY0-301 · Question #609
Which of the following ports would be blocked if Pete, a security administrator, wants to deny access to websites?
The correct answer is C. 80. Port 80 is the standard port for HTTP traffic, so blocking it denies access to unencrypted web browsing.
Question
Which of the following ports would be blocked if Pete, a security administrator, wants to deny access to websites?
Options
- A21
- B25
- C80
- D3389
How the community answered
(25 responses)- A8% (2)
- C88% (22)
- D4% (1)
Why each option
Port 80 is the standard port for HTTP traffic, so blocking it denies access to unencrypted web browsing.
Port 21 is used by FTP for control connections, which handles file transfers, not web browsing.
Port 25 is used by SMTP for sending email between mail servers, not for website access.
HTTP, the protocol used for standard web browsing, operates on TCP port 80 by default. Blocking port 80 at a firewall or proxy prevents clients from making HTTP requests to websites. To also block HTTPS web traffic, port 443 would additionally need to be blocked.
Port 3389 is used by RDP (Remote Desktop Protocol) for remote graphical desktop sessions, not for web browsing.
Concept tested: Well-known port numbers - HTTP port 80
Source: https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml
Topics
Community Discussion
No community discussion yet for this question.