WPA2 aes is always 128 bit key for both psk and enterprise. The number of characters from passphrase dont have anything to do with the key length. It is not even possible to select the key length. Always 128.

WPA 2 uses the National Institute of Standards and Technology (NIST)-recommended Advanced Encryption Standard (AES) encryption algorithm with the use of Counter Mode with Cipher Block Chaining Message Authentication Code Protocol (CCMP). AES Counter Mode is a block cipher that encrypts 128-bit blocks of data at a time with a 128-bit encryption key. The CCMP algorithm creates a message integrity code (MIC) that gives data origin authentication and data integrity for the wireless frame.

Selected Answer: A A ====> AES-128 is used.

https://www.cwnp.com/forums/posts?postNum=299964

WPA2 Support only AES-CCMP (CCNA 200-301 Official Cert Guide, Volume 1 - Page 662). (AES-Counter Mode CBC-MAC Protocol) The encryption algorithm used in the 802.11i security protocol. It uses the AES block cipher, but limits the key length to 128 bits. So I think its correct A - AS128

Selected Answer: A AES-128 is used.

Here is a link supporting this comment.

The Answer should be AES-128 bit! cisco says that themselves on their website https://www.cisco.com/assets/sol/sb/isa500_emulator/help/guide/ae1217496.html#:~:text=Encryption%3A%20Choose%20the%20encryption%20type%3A%2064%20bits%20(10%20hex%20digits)%2C%2064%20bits%20(5%20ASCII)%2C%20128%20bits%20(26%20hex%20digits)%2C%20or%20128%20bits%20(13%20ASCII).%20The%20default%20is%2064%20bits%20(10%20hex%20digits).%20The%20larger%20size%20keys%20provide%20stronger%20encryption%2C%20thus%20making%20the%20key%20more%20difficult%20to%20crack.

Notice! i found this link and now im confused.. anyone know whats the meaning of this? "Each wireless network device encrypts the network traffic by deriving its 128-bit encryption key from a 256-bit shared key" baised on that, i wonder what should be the answer... https://en.wikipedia.org/wiki/Wi-Fi_Protected_Access#:~:text=Each%20wireless%20network%20device%20encrypts%20the%20network%20traffic%20by%20deriving%20its%20128-bit%20encryption%20key%20from%20a%20256-bit%20shared%20key

Right, it's still 128-bit encryption

Selected Answer: A WPA2 requires the use of a new protocol, counter mode with cipher-block chaining message authentication protocol (CCMP). CCMP uses the AES block cipher, replacing the RC4 cipher used in wired equivalent privacy (WEP) and temporal key integrity protocol (TKIP). A block cipher handles data in blocks, while a streaming cipher like rivest cipher 4 (RC4) handles data bit by bit, in a serial stream. The encryption method is usually called CCMP/AES. AES uses a 128-bit key and encrypts data in 128-bit blocks. CCMP/AES uses several improvements, including temporal keys (TK), packet numbers (PN), nonce [number or bit string used only once], upper layer encryption, and additional authentication data (AAD). LINK: https://www.controleng.com/articles/wireless-security-ieee-802-11-and-ccmp-aes/

this is the same link the website answer used. AES-128bit Black on white https://www.cisco.com/c/en/us/support/docs/wireless-mobility/wireless-lan-wlan/67134-wpa2-config.html#:~:text=AES%20Counter%20Mode%20is%20a%20block%20cipher%20that%20encrypts%20128-bit%20blocks%20of%20data%20at%20a%20time%20with%20a%20128-bit%20encryption%20key.

I agree with AES-128. The shared key may be 256 bits long but the encryption is 128 bits. https://en.wikipedia.org/wiki/Wi-Fi_Protected_Access#:~:text=Each%20wireless%20network%20device%20encrypts,to%2063%20printable%20ASCII%20characters.

Selected Answer: C cccccccccccccccccccccccccccc

Selected Answer: A A is right

This is from Boson CourseWare: WPA2, which implements the 802.11i wireless standard, was made to fix the security vulnerabilities in the WPA standard. One improvement over WPA included in WPA2 is the encryption algorithm. Advanced Encryption System (AES) is a stronger encryption algorithm than the RC4 algorithm used by both WEP and WPA. AES uses a 128-bit block cipher to encrypt data and a security key of 128, 192, or 256 bits.

Selected Answer: A Thanks for all the posts. Here are my links confirming Option A 1 - he most significant upgrade in WPA2 is that it uses AES-CCMP encryption https://study-ccna.com/wifi-security/ 2- CCMP is 128bit https://en.wikipedia.org/wiki/CCMP_(cryptography)

Selected Answer: A AES-256 is more secure because of the longer key length, WPA2-PSK usually uses AES-128 encryption as standard.

Selected Answer: A It's A, but for those who want to think AES-256 is more secure, it wasn't made and meant to be used with that. That's what WPA3 is used with. You can use AES-128 and 256 with WPA3 for that.