220-1002 Question #210: Real Exam Question with Answer & Explanation

The correct answer is A: AES. WPA2 (Wi-Fi Protected Access 2) uses AES (Advanced Encryption Standard) with CCMP (Counter Mode with Cipher Block Chaining Message Authentication Code Protocol). AES is a symmetric block cipher that replaced the weaker RC4 cipher used by WEP and the transitional TKIP used by WPA

Question

Which of the following encryption methods is used by WPA2 to improve data security as compared to previous wireless encryption protocols?

Options

AAES
BTKIP
CS/MIME
D3DES

Explanation

WPA2 (Wi-Fi Protected Access 2) uses AES (Advanced Encryption Standard) with CCMP (Counter Mode with Cipher Block Chaining Message Authentication Code Protocol). AES is a symmetric block cipher that replaced the weaker RC4 cipher used by WEP and the transitional TKIP used by WPA (the first version). AES with 128-bit keys is significantly stronger and more resistant to cryptographic attacks. TKIP (B) was used by WPA1 as a stopgap improvement over WEP but is considered legacy. S/MIME (C) is an email encryption standard, not a wireless protocol. 3DES (D) is a block cipher used in some VPNs and older protocols but not in WPA2.

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