1). Which of the following are true of 802.11ac? Choose all that apply. a). Was
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Question
1). Which of the following are true of 802.11ac? Choose all that apply. a).Was ratified in 2013 b). Uses only in the 5 GHz frequency bands c). Use of channel bonding with the capability of using 80 and 160 MHz channels as compared to the 40 MHz channels allowed by 802.11n d).Provides the capability of using 256 QAM modulation which provides a significant increase in data throughput. e). Improved MIMO and beamforming capabilities over those provided by 802.11n 2). Match the following wireless security terms with the most appropriate description. (WPA2, WEP, WPA). a). Uses RC-4 stream cipher with no provision for automatically varying the encryption key.b) . Uses the RC-4 stream cipher. Does not use the passphrase itself for encryption. Employs Temporal Key Integrity Protocol (TKIP) c). Uses the AES block cipher along with Counter Mode with Cipher Block Chaining Message (CCMP). Cannbsp;optionally use RC-4 with Temporal Key Integrity Protocol (TKIP)
Explanation / Answer
1. In the case of 802.11ac, all the given statements are true.
a. 802.11ac is ratified in the ending days of 2013.
b. It uses only 5GHz frequency bands.
c. Use of channel bonding with the capability of using 80 and 160 MHz.
d. Can use 256 QAM modulation.
e. Beamforming capabilities nad MIMO are increased. In fact, MIMO supports up to 8 spatial streams.
2.
WPA2 matches with statement "C" since it uses Cipher Block Chaining Message(CCMP).
WPA uses Temporal Key Integrity Protocol(TKIP) which makes it match with the statement "B"
WEP is the oldest one and is less secured with no provision for automatically varying the encryption key which makes it match the statement "A".
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