The Advanced Encryption Standard (AES) symmetric cipher uses how many rounds of substitution and re-arranging when utilizing a 256-bit key size?

The answer is "13 rounds"

Explanation:

It is a code, family known as encryption methods of the unit. It is a block template, which uses a per-block encryption algorithm, and it usually measured in a bit for every block. It was accepted by the NIST at the end of 2000 as a replacement for DES.

In this encryption process, it implemented on 3 different steps on each of the clear text keys. In step 2 a variety of cycles based on the key type are preformed, and in 9 rounds are done on a 128-bit key, 11 rounds are done on a 192-bit key and 13 rounds on a 256-bit key called the AES-256 key.