Question

The port number used by the SSH Remote Login Protocol is ________.

• A. 7
• B. 18
• C. 20
• D. 22

Hint:

Remember these standard networking ports:

• Port 21: FTP (File Transfer - Control)
• Port 22: SSH (Secure Shell)
• Port 23: Telnet (Unencrypted Remote Login)
• Port 80: HTTP (Web)

Answer 1

The Correct Option is D

Step 1: Understanding Network Port Assignments:
In TCP/IP networks, port numbers are used to route network traffic to the correct application or service on a server. Standard protocols use well-known port numbers assigned by the Internet Assigned Numbers Authority (IANA).

Step 2: Evaluating the Options and Port Mapping:
Let's analyze the standard ports listed:

• Port 7: Used by the Echo Protocol (primarily used for network testing).
• Port 20: Used by FTP (File Transfer Protocol) for data transfer (Port $21$ is used for control connections).
• Port 22: Assigned exclusively to the SSH (Secure Shell) protocol. SSH is a secure, encrypted protocol used to log in and manage remote servers and network equipment over a command-line interface.

Step 3: Conclusion:
Therefore, the standard port number used by the SSH Remote Login Protocol is Port 22, corresponding to option (D).