单选题What is the purpose of the magic number in an LCP negotiation?（）AIt is used to detect loops.BIt is an interface identifier.CIt selects a compression algorithm.DIt specifies the transmission media.
单选题
What is the purpose of the magic number in an LCP negotiation?（）
A
It is used to detect loops.
B
It is an interface identifier.
C
It selects a compression algorithm.
D
It specifies the transmission media.
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