Implementing and Operating Cisco Security Core Technologies (SCOR) — Question 178

Which two key and block sizes are valid for AES? (Choose two.)

Answer options

• A. 64-bit block size, 112-bit key length
• B. 64-bit block size, 168-bit key length
• C. 128-bit block size, 192-bit key length
• D. 128-bit block size, 256-bit key length
• E. 192-bit block size, 256-bit key length

Correct answer: C, D

Explanation

The correct answers, C and D, represent valid configurations for AES, which supports a block size of 128 bits and key lengths of 128, 192, or 256 bits. Options A, B, and E are incorrect because AES does not utilize a 64-bit block size or support key lengths of 112 bits or 168 bits.