FTP and SSL are protocols which operate on port numbers:

  1. 21 and 443 respectively.

  2. 21 and 444 respectively.

  3. 23 and 443 respectively.

  4. 443 and 21 respectively.


Correct Option: A

AI Explanation

To answer this question, we need to understand the protocols FTP and SSL, as well as the port numbers they operate on.

FTP (File Transfer Protocol) is a standard network protocol used for transferring files between a client and a server on a computer network. It operates on port number 21.

SSL (Secure Sockets Layer) is a protocol for establishing encrypted links between web servers and browsers. It is commonly used to secure online transactions and data transfer. SSL operates on port number 443.

Now let's go through each option to determine the correct answer:

Option A) 21 and 443 respectively - This option is correct. FTP operates on port number 21, and SSL operates on port number 443.

Option B) 21 and 444 respectively - This option is incorrect. FTP operates on port number 21, but SSL operates on port number 443, not 444.

Option C) 23 and 443 respectively - This option is incorrect. FTP operates on port number 21, not 23. SSL operates on port number 443, not 23.

Option D) 443 and 21 respectively - This option is incorrect. FTP operates on port number 21, not 443. SSL operates on port number 443, not 21.

The correct answer is option A. FTP operates on port number 21, and SSL operates on port number 443.

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