Question

14. TKIP/RC4 encryption adds an extra of overhead to the body of an 802.11 MPDU. A. 16 bytes B. 12 bytes C. 20 bytes D. 10 bytes E. None of the above 15. An HT client STA is transmitting to an HT AP using modulation and coding scheme (MCS)#12 that defines 16 - QAM modulation, two spatial streams, a 40-MHz bonded channel and an 800 ns guard interval to achieve a data rate of 162 Mbps. According to the IEEE, which types of encryption should be used by the HT client STA? A. Static WEP B. Dynamic WEP C. TKIP/RC4 D. CCMP/AES E. All of the above 16. CCMP/AES uses a temporal key and encrypts data in blocks. A. 128-bit, 128-bit B. 128-bit, 192-bit C. 192-bit, 192-bit D. 192 - bit, 256-bit E. 256-bit, 256-bit 17. Given that CCMP uses a MIC for data integrity to protect the frame body and portions of the MAC header, what information needs to be constructed to protect certain fields in the MAC header? A. Nonce B. Extended IV C. ICV D. AAD E.PN 18. Which of the following is a FIPS encryption standard that uses a single 56-bit symmetric key? A. RC4 B. RCS C. DES D. 3DES E. AES 19. When using an 802.11 wireless controller solution, which device would be considered the authenticator? A. Access point B. RADIUS database C. LDAP D. WLAN controller E. VLAN

Answer 1

14.20 Bytes

When implementing TKIP because of the extra overhead from the extended IV and the MIC, a total 20 bytes of overhead is added to the body of an 802.11 MPDU.

15.All of the above

HT station should not use WEP or TKIP when communicating with other STAs that support stronger ciphers. HT STAs should not use pre-RSNA security methods to protect unicast frames if the RA or address 1 of the frame corresponds to an HT STA

16.128‐bit, 128‐bit

AES processing in CCMP uses AES with a 128-bit key and a 128-bit block size.

17.AAD
Additional Authentication Data (AAD) is constructed from portions of the MPDU header. This information is used for data integrity of portions of the MAC header. Receiving stations can then validate the integrity of these MAC header fields. The MIC protects the AAD information and the frame body for data integrity

18.DES

3DES is a FIPS encryption standard, but it uses three keys with an effective key size of 168 bits.

19.WLAN controller

WLAN controller usually functions as the authenticator. When an 802.1X/EAP solution is deployed in a wireless controller, the virtual controlled and uncontrolled ports exist on the WLAN controller.

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