What are the most commonly used port numbers in networking?
A factual question testing familiarity with standard service ports.
Why Interviewers Ask This
Knowing standard ports is essential for configuring firewalls, debugging services, and understanding network traffic.
How to Answer This Question
List common ports: HTTP (80), HTTPS (443), SSH (22), FTP (21), DNS (53), SMTP (25), MySQL (3306). Mention their associated protocols.
Key Points to Cover
- HTTP/HTTPS ports
- SSH and FTP
- DNS and Email
- Database ports
Sample Answer
Common port numbers include 80 for HTTP, 443 for HTTPS, 22 for SSH, and 21 for FTP. DNS operates on port 53, while SMTP for email is typically 25. Database services like MySQL often use port 3306. Knowing these helps in…
Common Mistakes to Avoid
- Memorizing wrong numbers
- Confusing TCP/UDP ports
- Omitting common ones
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