Network Security Questions and Answers – IEEE 802.11i WLAN Security – III

This set of Network Security Multiple Choice Questions & Answers (MCQs) focuses on “IEEE 802.11i WLAN Security – III”.

1. In CCMP a 128-bit AES Key is used for both integrity and confidentiality. The scheme uses a ___________ bit packet number to construct a nonce to prevent __________ attacks.
a) 48, replay
b) 64, replay
c) 48, transient
d) 64, transient
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2. HMAC SHA-1 produces a hash of length-
a) 180 bits
b) 240 bits
c) 160 bits
d) 40 bits
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3. In the IEEE 802.11i PRF, a nonce is generated by the following expression –
nonce = PRF (Random Number, “InitCounter”, MAC || Time, Len)
What is the value of the ‘Len’ (desirable number of pseudorandom bits)?
a) 64
b) 128
c) 256
d) 512
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4. Nonce = PRF (Random Number, “InitCounter”, MAC || Time, Len)
What is the Key ‘K’ in the above expression?
a) InitCounter
b) Random Number
c) PRF
d) Time
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5. What is ‘Len’ (desirable number of pseudorandom bits) field in the case of CCMP PTK computation?
a) 256
b) 384
c) 568
d) 298
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6. The message input to the IEEE 802.11 pseudorandom Function consists of 4 items concatenated together. Which of the following option is not a part of this message input –
a) the parameter B
b) a byte with value FF (11111111)
c) the parameter A
d) counter value i
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7. A __________ is a secret key shared by the AP and a STA and installed in some fashion outside the scope of IEEE 802.11i.
a) pre-shared key
b) pairwise transient key
c) master session key
d) key conformation key
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8. The Pairwise master key (PMK) can be derived from either PSK or MSK.
a) True
b) False
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9. The pairwise transient key (PTK) is derived from –
a) Key Confirmation Key (KCK)
b) Temporal Key (TK)
c) Pairwise master Key (PMK)
d) Pre-Shared Key (PSK)
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10. The pairwise transient key (PTK) consists of ______________ keys.
a) 3
b) 4
c) 5
d) 2
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11. Which Hashing algorithm is used to derive the PTK for PMK?
a) SHA-1
b) SHA-2
c) SHA-3
d) MD-5
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Sanfoundry Global Education & Learning Series – Cryptography and Network Security.

To practice all areas of Cryptography and Network Security, here is complete set of 1000+ Multiple Choice Questions and Answers.