Cisco Certified Network Associate (CCNA) 2025 – 400 Free Practice Questions to Pass the Exam

The Advanced Encryption Standard (AES) is known for its flexibility in terms of key sizes, which allows it to utilize key lengths of 128 bits, 192 bits, and 256 bits. This capability enhances its security, as longer keys generally provide better protection against brute-force attacks. The choice of key size can be made based on the specific security requirements of the data being encrypted. This characteristic is particularly important in modern encryption practices, as different environments may call for varying levels of security strength.

The other options do not accurately describe AES. The algorithm is based on a fixed block size of 128 bits, and while it's a symmetric encryption method, it is not restricted to one specific characteristic, such as being a symmetric algorithm only. Additionally, AES operates with a set number of rounds depending on the key size (10, 12, or 14 rounds), so the statement regarding an unlimited number of encryption passes does not apply.