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What is a valid size of the Group Temporal Key (GTK) in WEP?

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What is a valid size of the Group Temporal Key (GTK) in WEP?

(a) 40 bits

(b) 128 bits

(c) 512 bits

(d) 80 bits

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Correct option is (a) 40 bits

The explanation is: GTK in WEP is of 40 bits or 104 bits.

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