CompTIA Tech+ (FC0-U71)IT Concepts and TerminologyEasy
A security analyst is investigating network traffic and observes a data packet with a destination port of 22. What service is MOST likely being targeted or used by this packet?
- ADNS (Domain Name System)
- BFTP (File Transfer Protocol)
- CHTTP (Hypertext Transfer Protocol)
- DSSH (Secure Shell)
Show answer & explanationAnswer & explanation
Correct answer: D. SSH (Secure Shell)
Port 22 is the well-known port number associated with the Secure Shell (SSH) protocol, which is used for secure remote access and file transfers.
Why the other options are wrong
- A. DNS typically uses port 53.
- B. FTP typically uses ports 20 and 21.
- C. HTTP typically uses port 80 (or 443 for HTTPS).
Well-Known Port Numbers
Standardized port numbers (0-1023) assigned to common network services by the Internet Assigned Numbers Authority (IANA).
- Facilitate communication between clients and servers.
- Help identify the application protocol being used.
- Examples: HTTP (80), HTTPS (443), FTP (20, 21), SSH (22).
Memory trick: 22 is SSH, secure and free.