CompTIA A+ Core 1 (220-1201)NetworkingEasy
A user reports that a website loads correctly when typing 'https://company.com' but fails with a connection error when typing 'http://company.com'. Which port is likely being blocked by the firewall?
- A443
- B21
- C80
- D53
Show answer & explanationAnswer & explanation
Correct answer: C. 80
HTTP (unencrypted web traffic) uses TCP port 80, while HTTPS uses port 443. Since HTTPS works but HTTP does not, port 80 is likely blocked.
Why the other options are wrong
- A. Port 443 is HTTPS, which is confirmed working in this scenario.
- B. Port 21 is used for FTP control, unrelated to web browsing.
- D. Port 53 is used for DNS name resolution, not web page delivery.
HTTP Port 80
TCP port 80 is used for unencrypted web traffic using the HTTP protocol.
- HTTP = port 80 (unencrypted)
- HTTPS = port 443 (encrypted with TLS/SSL)
- Firewalls can block one port while allowing the other
Memory trick: HTTP ate(80) plain, HTTPS(443) locked it up.